iphone Programming Glossary: cgimage

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

I am currently trying to obtain the alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image.. CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image.. image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace..

Resizing UIimages pulled from the Camera also ROTATES the UIimage?

http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage

I am using this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone.. UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast.. resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast..

Convert image to grayscale

http://stackoverflow.com/questions/1298867/convert-image-to-grayscale

#define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image.. 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow.. 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width CGColorSpaceRef..

How to Rotate a UIImage 90 degrees?

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

invalid data bytes row should be at least 1708 for 8 integer bits component 3 components kCGImageAlphaPremultipliedLast. I don't get an error whenever I provide a SMALLER size as the target size BTW.. sourceImage anImage CGFloat targetWidth targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef.. targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef colorSpaceInfo CGImageGetColorSpace..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

void pixelData self.size.width self.size.height RGBA_8_BIT bytesPerRow colorSpace kCGImageAlphaPremultipliedLast Make sure we have our context if context free pixelData NSLog @ Context not.. color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get a pointer to the image pixelData associated with the bitmap context. pixelData RGBAPixel.. subclassed UIImageView and declared with corresponding synthesized properties Reference to Quartz CGImage for receiver self CFDataRef bitmapData Buffer holding raw pixel data copied from Quartz CGImage held..

Cropping a UIImage

http://stackoverflow.com/questions/158914/cropping-a-uiimage

simple class method to do this but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef.. but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect.. CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage CGImage cropRect or use the UIImage wherever you..

How do I export UIImage array as a movie?

http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie

That lets you feed the writer input data from a CVPixelBuffer that ™s quite easy to create from a CGImage. writerInput appendSampleBuffer sampleBuffer 4 Finish the session writerInput markAsFinished videoWriter.. of blanks but I think that the only really hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys.. hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys NSNumber numberWithBool..

Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints?

http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints

imageSize.height 2 imageSize.width imageSize.height CGContextDrawImage context imageRect baseImage CGImage else @synchronized issue CGPDFPageRef pdfPage CGPDFDocumentGetPage issue.pdfDoc pageIndex 1 pdfToPageTransform..

iOS UIImagePickerController result image orientation after upload

http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload

case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL.. calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage.. ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM ctx transform..

How to Mask an UIImageView

http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview

self maskImage image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight.. mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent.. UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent..

Make movie file with picture Array and song file, using AVAsset

http://stackoverflow.com/questions/6061092/make-movie-file-with-picture-array-and-song-file-using-avasset

kCMTimeZero Video encoding CVPixelBufferRef buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i.. NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if.. frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if adaptor.assetWriterInput.readyForMoreMediaData..

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

a pixel alpha value for a UIImage I am currently trying to obtain the alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image.. alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB.. in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB rawData malloc height width..

Resizing UIimages pulled from the Camera also ROTATES the UIimage?

http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage

width 400 height 533 myImageView setImage myResizedImg I am using this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast CGContextRef.. setImage myResizedImg I am using this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast CGContextRef bitmap CGBitmapContextCreate.. setImage myResizedImg I am using this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast CGContextRef bitmap CGBitmapContextCreate NULL..

Convert image to grayscale

http://stackoverflow.com/questions/1298867/convert-image-to-grayscale

to convert an image into grayscale in the following way #define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width CGColorSpaceRef.. into grayscale in the following way #define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB.. way #define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB unsigned..

How to Rotate a UIImage 90 degrees?

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

size of the UIImage but I get an error Error CGBitmapContextCreate invalid data bytes row should be at least 1708 for 8 integer bits component 3 components kCGImageAlphaPremultipliedLast. I don't get an error whenever I provide a SMALLER size as the target size BTW . Can any of you show me how to just ROTATE my UIImage 90 degrees.. CGSize targetSize UIImage anImage UIImage sourceImage anImage CGFloat targetWidth targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef colorSpaceInfo CGImageGetColorSpace imageRef if bitmapInfo.. UIImage anImage UIImage sourceImage anImage CGFloat targetWidth targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef colorSpaceInfo CGImageGetColorSpace imageRef if bitmapInfo kCGImageAlphaNone bitmapInfo kCGImageAlphaNoneSkipLast..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

CGBitmapContextCreate. self setContext CGBitmapContextCreate void pixelData self.size.width self.size.height RGBA_8_BIT bytesPerRow colorSpace kCGImageAlphaPremultipliedLast Make sure we have our context if context free pixelData NSLog @ Context not created Draw the image to the bitmap context. The memory allocated.. will then contain the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get a pointer to the image pixelData associated with the bitmap context. pixelData RGBAPixel CGBitmapContextGetData context return pixelData Read Only.. RGBPixel byte red byte green byte blue RGBPixel Step 3. I subclassed UIImageView and declared with corresponding synthesized properties Reference to Quartz CGImage for receiver self CFDataRef bitmapData Buffer holding raw pixel data copied from Quartz CGImage held in receiver self UInt8 pixelByteData A pointer to the first..

Cropping a UIImage

http://stackoverflow.com/questions/158914/cropping-a-uiimage

my response to the same question elsewhere There isn't a simple class method to do this but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage CGImage cropRect.. elsewhere There isn't a simple class method to do this but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage CGImage cropRect or use the UIImage wherever.. is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage CGImage cropRect or use the UIImage wherever you like UIImageView setImage UIImage imageWithCGImage imageRef..

How do I export UIImage array as a movie?

http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie

samples Or you can use AVAssetWriterInputPixelBufferAdaptor. That lets you feed the writer input data from a CVPixelBuffer that ™s quite easy to create from a CGImage. writerInput appendSampleBuffer sampleBuffer 4 Finish the session writerInput markAsFinished videoWriter endSessionAtSourceTime ¦] videoWriter finishWriting You.. ¦] videoWriter finishWriting You ™ll still have to fill in a lot of blanks but I think that the only really hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys NSNumber numberWithBool YES kCVPixelBufferCGImageCompatibilityKey.. to fill in a lot of blanks but I think that the only really hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys NSNumber numberWithBool YES kCVPixelBufferCGImageCompatibilityKey NSNumber numberWithBool..

Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints?

http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints

imageSize.width 2 self.bounds.size.height imageSize.height 2 imageSize.width imageSize.height CGContextDrawImage context imageRect baseImage CGImage else @synchronized issue CGPDFPageRef pdfPage CGPDFDocumentGetPage issue.pdfDoc pageIndex 1 pdfToPageTransform CGPDFPageGetDrawingTransform pdfPage kCGPDFMediaBox..

iOS UIImagePickerController result image orientation after upload

http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload

1 1 break case UIImageOrientationUp case UIImageOrientationDown case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent.. underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM ctx transform switch self.imageOrientation.. applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM ctx transform switch self.imageOrientation case UIImageOrientationLeft..

How to Mask an UIImageView

http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview

@ mask.png result of the masking method UIImage maskedImage self maskImage image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel.. method UIImage maskedImage self maskImage image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow.. UIImage maskedImage self maskImage image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow..

Make movie file with picture Array and song file, using AVAsset

http://stackoverflow.com/questions/6061092/make-movie-file-with-picture-array-and-song-file-using-avasset

Start a session videoWriter startWriting videoWriter startSessionAtSourceTime kCMTimeZero Video encoding CVPixelBufferRef buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok.. kCMTimeZero Video encoding CVPixelBufferRef buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if adaptor.assetWriterInput.readyForMoreMediaData printf appending.. CVPixelBufferRef buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if adaptor.assetWriterInput.readyForMoreMediaData printf appending d attemp d n frameCount j CMTime..

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

value for a UIImage I am currently trying to obtain the alpha value of a pixel in a UIImageView. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage.. I have obtained the CGImage from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef.. from UIImageView image and created a RGBA byte array from this. Alpha is premultiplied. CGImageRef image uiImage.CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceRGB..

Resizing UIimages pulled from the Camera also ROTATES the UIimage?

http://stackoverflow.com/questions/1260249/resizing-uiimages-pulled-from-the-camera-also-rotates-the-uiimage

myResizedImg I am using this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo.. this to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast.. to resize it UIImage resizeImage UIImage anImage width int width height int height CGImageRef imageRef anImage CGImage CGImageAlphaInfo alphaInfo CGImageGetAlphaInfo imageRef if alphaInfo kCGImageAlphaNone alphaInfo kCGImageAlphaNoneSkipLast CGContextRef..

Convert image to grayscale

http://stackoverflow.com/questions/1298867/convert-image-to-grayscale

in the following way #define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow.. bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width.. bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef image pImage CGImage NSUInteger width CGImageGetWidth image NSUInteger height CGImageGetHeight image NSUInteger bytesPerRow bytesPerPixel width CGColorSpaceRef colorSpace..

How to Rotate a UIImage 90 degrees?

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

Error CGBitmapContextCreate invalid data bytes row should be at least 1708 for 8 integer bits component 3 components kCGImageAlphaPremultipliedLast. I don't get an error whenever I provide a SMALLER size as the target size BTW . Can any of you show.. anImage UIImage sourceImage anImage CGFloat targetWidth targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef colorSpaceInfo CGImageGetColorSpace.. anImage CGFloat targetWidth targetSize.height CGFloat targetHeight targetSize.width CGImageRef imageRef sourceImage CGImage CGBitmapInfo bitmapInfo CGImageGetBitmapInfo imageRef CGColorSpaceRef colorSpaceInfo CGImageGetColorSpace imageRef if bitmapInfo..

How to get the RGB values for a pixel on an image on the iphone

http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone

CGBitmapContextCreate void pixelData self.size.width self.size.height RGBA_8_BIT bytesPerRow colorSpace kCGImageAlphaPremultipliedLast Make sure we have our context if context free pixelData NSLog @ Context not created Draw the image.. in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get a pointer to the image pixelData associated with the bitmap context. pixelData RGBAPixel CGBitmapContextGetData.. RGBPixel Step 3. I subclassed UIImageView and declared with corresponding synthesized properties Reference to Quartz CGImage for receiver self CFDataRef bitmapData Buffer holding raw pixel data copied from Quartz CGImage held in receiver self UInt8..

Cropping a UIImage

http://stackoverflow.com/questions/158914/cropping-a-uiimage

There isn't a simple class method to do this but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect.. method to do this but there is a function that you can use to get the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage.. the desired results CGImageCreateWithImageInRect CGImageRef CGRect will help you out. Here's a short example using it CGImageRef imageRef CGImageCreateWithImageInRect largeImage CGImage cropRect or use the UIImage wherever you like UIImageView setImage..

How do I export UIImage array as a movie?

http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie

That lets you feed the writer input data from a CVPixelBuffer that ™s quite easy to create from a CGImage. writerInput appendSampleBuffer sampleBuffer 4 Finish the session writerInput markAsFinished videoWriter endSessionAtSourceTime.. have to fill in a lot of blanks but I think that the only really hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys.. that the only really hard remaining part is getting a pixel buffer from a CGImage CVPixelBufferRef newPixelBufferFromCGImage CGImageRef image NSDictionary options NSDictionary dictionaryWithObjectsAndKeys NSNumber numberWithBool YES kCVPixelBufferCGImageCompatibilityKey..

Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints?

http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints

imageSize.height 2 imageSize.width imageSize.height CGContextDrawImage context imageRect baseImage CGImage else @synchronized issue CGPDFPageRef pdfPage CGPDFDocumentGetPage issue.pdfDoc pageIndex 1 pdfToPageTransform CGPDFPageGetDrawingTransform..

iOS UIImagePickerController result image orientation after upload

http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload

case UIImageOrientationDown case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width.. the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM.. above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height CGImageGetBitsPerComponent self.CGImage 0 CGImageGetColorSpace self.CGImage CGImageGetBitmapInfo self.CGImage CGContextConcatCTM ctx transform switch self.imageOrientation..

How to Mask an UIImageView

http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview

UIImage maskedImage self maskImage image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent.. image withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel.. withMask mask ... UIImage maskImage UIImage image withMask UIImage maskImage CGImageRef maskRef maskImage.CGImage CGImageRef mask CGImageMaskCreate CGImageGetWidth maskRef CGImageGetHeight maskRef CGImageGetBitsPerComponent maskRef CGImageGetBitsPerPixel..

Make movie file with picture Array and song file, using AVAsset

http://stackoverflow.com/questions/6061092/make-movie-file-with-picture-array-and-song-file-using-avasset

videoWriter startSessionAtSourceTime kCMTimeZero Video encoding CVPixelBufferRef buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size.. buffer NULL convert uiimage to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if adaptor.assetWriterInput.readyForMoreMediaData.. to CGImage. int frameCount 0 for int i 0 i 20 i buffer self pixelBufferFromCGImage m_PictArray objectAtIndex i CGImage andSize size BOOL append_ok NO int j 0 while append_ok j 30 if adaptor.assetWriterInput.readyForMoreMediaData printf..

Extracting images from a PDF

http://stackoverflow.com/questions/2475450/extracting-images-from-a-pdf

cgColorSpace const char name NULL colorSpaceName NULL renderingIntentName NULL CFDataRef imageDataPtr NULL CGImageRef cgImage maskImage NULL CGImageRef sourceImage NULL CGDataProviderRef dataProvider CGColorRenderingIntent renderingIntent CGFloat.. spp rowBytes cgColorSpace 0 dataProvider decodeValues interpolation renderingIntent CGDataProviderRelease dataProvider cgImage sourceImage if maskImage NULL cgImage CGImageCreateWithMask sourceImage maskImage CGImageRelease sourceImage CGImageRelease.. decodeValues interpolation renderingIntent CGDataProviderRelease dataProvider cgImage sourceImage if maskImage NULL cgImage CGImageCreateWithMask sourceImage maskImage CGImageRelease sourceImage CGImageRelease maskImage else cgImage sourceImage..

Image processing Glamour filter in iphone

http://stackoverflow.com/questions/3549396/image-processing-glamour-filter-in-iphone

share improve this question Here is the code for sepia image UIImage makeSepiaScale UIImage image CGImageRef cgImage image CGImage CGDataProviderRef provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider.. makeSepiaScale UIImage image CGImageRef cgImage image CGImage CGDataProviderRef provider CGImageGetDataProvider cgImage CFDataRef bitmapData CGDataProviderCopyData provider UInt8 data UInt8 CFDataGetBytePtr bitmapData int width image.size.width..

how to take a screenshot of the iPhone programmatically?

http://stackoverflow.com/questions/3610604/how-to-take-a-screenshot-of-the-iphone-programmatically

ctx 0.0 screenSize.height CGContextScaleCTM ctx 1.0 1.0 CALayer self.view.layer renderInContext ctx CGImageRef cgImage CGBitmapContextCreateImage ctx UIImage image UIImage imageWithCGImage cgImage CGImageRelease cgImage CGContextRelease ctx.. renderInContext ctx CGImageRef cgImage CGBitmapContextCreateImage ctx UIImage image UIImage imageWithCGImage cgImage CGImageRelease cgImage CGContextRelease ctx UIImageJPEGRepresentation image 1.0 writeToFile @ screen.jpg atomically NO Note.. ctx CGImageRef cgImage CGBitmapContextCreateImage ctx UIImage image UIImage imageWithCGImage cgImage CGImageRelease cgImage CGContextRelease ctx UIImageJPEGRepresentation image 1.0 writeToFile @ screen.jpg atomically NO Note that if you run your..

CoreGraphics for retina display

http://stackoverflow.com/questions/4707465/coregraphics-for-retina-display

section.origin.y CGContextDrawImage ctx CGRectMake 0 0 originalWidth originalHeight image CGImage CGImageRef cgImage CGBitmapContextCreateImage ctx UIImage resultImage UIImage alloc initWithCGImage cgImage CGContextRelease ctx CGImageRelease.. image CGImage CGImageRef cgImage CGBitmapContextCreateImage ctx UIImage resultImage UIImage alloc initWithCGImage cgImage CGContextRelease ctx CGImageRelease cgImage return resultImage How do I change this to make it retina compatible. Thanks.. ctx UIImage resultImage UIImage alloc initWithCGImage cgImage CGContextRelease ctx CGImageRelease cgImage return resultImage How do I change this to make it retina compatible. Thanks in advance for your help Best DV iphone core..

iOS CVImageBuffer distorted from AVCaptureSessionDataOutput with AVCaptureSessionPresetPhoto

http://stackoverflow.com/questions/6540710/ios-cvimagebuffer-distorted-from-avcapturesessiondataoutput-with-avcapturesessio

bufferHeight 8 bytesPerRow colorSpace kCGBitmapByteOrder32Little kCGImageAlphaPremultipliedFirst CGImageRef cgImage CGBitmapContextCreateImage context UIImage anImage UIImage imageWithCGImage cgImage This shows an undistorted video frame... CGImageRef cgImage CGBitmapContextCreateImage context UIImage anImage UIImage imageWithCGImage cgImage This shows an undistorted video frame. I've done a bunch of searching and can't seem to fix it. My hunch is that it's a..

Is programmatically inverting the colors of an image possible?

http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible

linePointer 2 b linePointer 3 255 linePointer 4 get a CG image from the context wrap that into a UIImage CGImageRef cgImage CGBitmapContextCreateImage context UIImage returnImage UIImage imageWithCGImage cgImage clean up CGImageRelease cgImage.. that into a UIImage CGImageRef cgImage CGBitmapContextCreateImage context UIImage returnImage UIImage imageWithCGImage cgImage clean up CGImageRelease cgImage CGContextRelease context free memoryPool and return return returnImage @end So that adds.. CGBitmapContextCreateImage context UIImage returnImage UIImage imageWithCGImage cgImage clean up CGImageRelease cgImage CGContextRelease context free memoryPool and return return returnImage @end So that adds a category method to UIImage that..

Make Background of UIView a Gradient Without Sub Classing

http://stackoverflow.com/questions/844710/make-background-of-uiview-a-gradient-without-sub-classing

bitmapContext myGradient CGPointMake 0.0f 0.0f CGPointMake 320.0f 480.0f 0 Create a CGImage from context CGImageRef cgImage CGBitmapContextCreateImage bitmapContext Create a UIImage from CGImage UIImage uiImage UIImage imageWithCGImage cgImage.. CGBitmapContextCreateImage bitmapContext Create a UIImage from CGImage UIImage uiImage UIImage imageWithCGImage cgImage Release the CGImage CGImageRelease cgImage Release the bitmap context CGContextRelease bitmapContext Release the color space.. Create a UIImage from CGImage UIImage uiImage UIImage imageWithCGImage cgImage Release the CGImage CGImageRelease cgImage Release the bitmap context CGContextRelease bitmapContext Release the color space CGColorSpaceRelease colorSpace Create..

How to merge the perspective image(3D Transform)?

http://stackoverflow.com/questions/12457047/how-to-merge-the-perspective-image3d-transform

here mergedImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext iphone uiimage core image cgimage share improve this question You could create a CGImageRef that contain the distorted image to put on top with the background..

Convert image to grayscale

http://stackoverflow.com/questions/1298867/convert-image-to-grayscale

self processImage image But imageToDisplay doesn't display. What may be the problem Thanks. iphone cocoa touch cgimage share improve this question What exactly takes place when you use this function Is the function returning an invalid..

How do I create a mutable array of CGImageRefs?

http://stackoverflow.com/questions/1392321/how-do-i-create-a-mutable-array-of-cgimagerefs

more costly to use UIImages instead of CGImageRefs as the elements of the collection iphone objective c arrays uikit cgimage share improve this question Getting the CGImageRef out of an UIImage via image.CGImage can be costly. From the documentation..

takepicture() vs UIGetScreenImage()

http://stackoverflow.com/questions/1531815/takepicture-vs-uigetscreenimage

legal and b would it be possible for takepicture method to do the same sort of thing iphone uiimagepickercontroller cgimage share improve this question RedLaser is definitely using UIGetScreenImage . A quick glance at the symbols in their library..

CGImage/UIImage lazily loading on UI thread causes stutter

http://stackoverflow.com/questions/1815476/cgimage-uiimage-lazily-loading-on-ui-thread-causes-stutter

Thanks for reading all that any advice would be greatly appreciated iphone uiimage lazy loading exc bad access cgimage share improve this question The UIGraphics methods are designed to be called from the main thread only. They are probably..

iPhone: Changing CGImageAlphaInfo of CGImage

http://stackoverflow.com/questions/2457116/iphone-changing-cgimagealphainfo-of-cgimage

formatted files so I will have to check my app's imported images and correct for this problem. iphone png alpha cgimage cgbitmapcontextcreate share improve this question Yeah I had problems with 8 bit indexed .PNGs. I had to convert it..

How exactly to make a CGImageRef from an image on disk

http://stackoverflow.com/questions/3550201/how-exactly-to-make-a-cgimageref-from-an-image-on-disk

a CGImageRef. Also for bonus points is there anyway to load a GIF into a CGImageRef iphone jpeg quartz graphics gif cgimage share improve this question gcamp is more or less correct you are pretty safe to use this on a background thread but..

iPad (very) simple drawing

http://stackoverflow.com/questions/3956202/ipad-very-simple-drawing

self.view bringSubviewToFront closeButton self.view bringSubviewToFront clearButton point1 point2 iphone ipad draw cgimage share improve this question One of my apps also needed some simple drawing. Here is a slightly modified version of it...

iPhone CGContextRef CGBitmapContextCreate unsupported parameter combination

http://stackoverflow.com/questions/5545600/iphone-cgcontextref-cgbitmapcontextcreate-unsupported-parameter-combination

newImageRef return newImage Can someone explain to me way I have this issue Thank you Andrei iphone uiimage cgcontext cgimage cgbitmapcontextcreate share improve this question I figured out it's a problem with the color space. Just replace CGImageGetColorSpace..

Getting RGB pixel data from CGImage

http://stackoverflow.com/questions/6073259/getting-rgb-pixel-data-from-cgimage

at here. How can I get an array of RGB values or something similar so I can work with them. Thanks Rich iphone ios cgimage share improve this question Here's some sample code that will print a bunch of relevant info about an image as well.. perhaps you can adapt it to your needs void imageDump NSString file UIImage image UIImage imageNamed file CGImageRef cgimage image.CGImage size_t width CGImageGetWidth cgimage size_t height CGImageGetHeight cgimage size_t bpr CGImageGetBytesPerRow.. NSString file UIImage image UIImage imageNamed file CGImageRef cgimage image.CGImage size_t width CGImageGetWidth cgimage size_t height CGImageGetHeight cgimage size_t bpr CGImageGetBytesPerRow cgimage size_t bpp CGImageGetBitsPerPixel cgimage..

Saving imageRef from GLPaint creates completely black image

http://stackoverflow.com/questions/9857912/saving-imageref-from-glpaint-creates-completely-black-image

bitmapInfo kCGBitmapByteOrderDefault CGColorRenderingIntent renderingIntent kCGRenderingIntentDefault make the cgimage CGImageRef imageRef CGImageCreate w s h s bitsPerComponent bitsPerPixel bytesPerRow colorSpaceRef bitmapInfo provider NULL..

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