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2014/10/15 ¤U¤È 10:05:00
iphone Programming Glossary: cgbitmapcontextgetdataCan I edit the pixels of the UIImage's property CGImage http://stackoverflow.com/questions/1281210/can-i-edit-the-pixels-of-the-uiimages-property-cgimage by calling CGBitmapContextCreate ... ... CGContextDrawImage m_Context rect srcImage.CGImage m_Bits unsigned char CGBitmapContextGetData mContext void postProcess CGContextRelease m_Context free m_Bits UIImage doProcess CGPoint pt just a example unsigned char..
How to NSLog pixel RGB from a UIImage? http://stackoverflow.com/questions/1352989/how-to-nslog-pixel-rgb-from-a-uiimage pixel share improve this question Did this direction work for you I'd get pixel data like this UInt32 pixels CGBitmapContextGetData ctx #define getRed p p 0x000000FF #define getGreen p p 0x0000FF00 8 #define getBlue p p 0x00FF0000 16 display RGB values..
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 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 Data Previous information method 2 Step 1. I declared a type for byte typedef unsigned..
http://stackoverflow.com/questions/5590216/polaroid-filter-from-uiimage CGRectMake 0 0 CGBitmapContextGetWidth bitmapContext CGBitmapContextGetHeight bitmapContext originalImage UInt8 data CGBitmapContextGetData bitmapContext int numComponents 4 int bytesInContext CGBitmapContextGetHeight bitmapContext CGBitmapContextGetBytesPerRow..
How to pull out the ARGB component from BitmapContext on iPhone? http://stackoverflow.com/questions/561663/how-to-pull-out-the-argb-component-from-bitmapcontext-on-iphone colorSpace CGContextDrawImage context CGRectMake 0 0 image.size.width image.size.height image.CGImage pixelData CGBitmapContextGetData context return self float alphaAtX int x y int y get alpha component using the pointer 'pixelData' return pixelData y width.. the memory. Simply pass NULL i.s.o. pixelData and as long as you keep the reference count up on your context the CGBitmapContextGetData context will remain valid. You're using alpha as if it was the last entry RGBA not ARGB use it as such in the creation of.. colorSpace CGContextDrawImage context CGRectMake 0 0 image.size.width image.size.height image.CGImage pixelData CGBitmapContextGetData context ... with context being a member variable initialized to NULL will already be a step in the right direction. share..
How to make one color transparent on a UIImage? http://stackoverflow.com/questions/633722/how-to-make-one-color-transparent-on-a-uiimage kCGImageAlphaPremultipliedFirst CGRect rect 0 0 mWidth mHeight CGContextDrawImage cgctx rect ref bufferdata CGBitmapContextGetData cgctx CGDataProviderRef provider CGDataProviderCreateWithData NULL bufferdata mWidth mHeight 4 NULL CGImageRef savedimageref..
Blur an UIImage on change of slider http://stackoverflow.com/questions/8758433/blur-an-uiimage-on-change-of-slider rect cgImage Now we can get a pointer to the image data associated with the bitmap context. srcData unsigned char CGBitmapContextGetData context if srcData NULL size_t dataSize bpr height finalData malloc dataSize destData malloc dataSize memcpy finalData srcData..
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