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2014/10/15 ¤U¤È 10:09:56

iphone Programming Glossary: grayscale

Any idea why this image masking code does not work?

http://stackoverflow.com/questions/1133248/any-idea-why-this-image-masking-code-does-not-work

there's no transparency in it. Then there is the image mask which is PNG 8bit without alpha channel. It is just black grayscale and white. I create both images as UIImage. Both display correctly when putting them into an UIImageView. Then I create.. that around i.e. use this image as the mask and the mask as the color image to mask then I get something very ugly in grayscale but masked . Any idea what's wrong with my code UPDATE I just googled for an different b w png to use it as a mask. And..

Convert image to grayscale

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

image to grayscale I am trying to convert an image into grayscale in the following way #define bytesPerPixel 4 #define bitsPerComponent 8.. image to grayscale I am trying to convert an image into grayscale in the following way #define bytesPerPixel 4 #define bitsPerComponent 8 unsigned char getBytesForImage UIImage pImage CGImageRef.. CGRectMake 0 0 m_width m_height i CGImage CGContextRelease context CGColorSpaceRelease colorSpace now convert to grayscale uint8_t m_imageData uint8_t malloc m_width m_height for int y 0 y m_height y for int x 0 x m_width x uint32_t rgbPixel..

Convert Image to B&W problem CGContext - iPhone Dev

http://stackoverflow.com/questions/3340564/convert-image-to-bw-problem-cgcontext-iphone-dev

color space CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceGray Create bitmap content with current image size and grayscale colorspace CGContextRef context CGBitmapContextCreate nil image.size.width image.size.height 8 0 colorSpace kCGImageAlphaNone.. kCGImageAlphaNone Draw image into current context with specified rectangle using previously defined context with grayscale colorspace CGContextDrawImage context imageRect image CGImage Create bitmap image info from pixel data in current context.. and bitmap information CGColorSpaceRelease colorSpace CGContextRelease context CFRelease imageRef Return the new grayscale image return newImage @lessfame iphone objective c camera ios cgcontext share improve this question K I got it. What..

How do I convert the live video feed from the iPhone camera to grayscale?

http://stackoverflow.com/questions/4381513/how-do-i-convert-the-live-video-feed-from-the-iphone-camera-to-grayscale

do I convert the live video feed from the iPhone camera to grayscale How would I take the live frames from the iPhone camera convert them to grayscale and then display them on the screen in.. feed from the iPhone camera to grayscale How would I take the live frames from the iPhone camera convert them to grayscale and then display them on the screen in my application iphone cocoa touch avfoundation share improve this question To.. I've now created an open source framework that encapsulates this OpenGL ES 2.0 video processing and it has a built in grayscale filter that you can use for this. You can use a GPUImageGrayscaleFilter applied to a video source to do a fast conversion..

Recreate recipient bubble behaviour in Mail.app / Three20

http://stackoverflow.com/questions/5247072/recreate-recipient-bubble-behaviour-in-mail-app-three20

model CGColorSpaceGetModel space if model kCGColorSpaceModelMonochrome monochrome color space has one grayscale value and one alpha CGContextSetRGBFillColor context colors 0 colors 0 colors 0 colors 1 else else a R G B A scheme is assumed...

How to apply black and white effect to a color video in iOS

http://stackoverflow.com/questions/5739962/how-to-apply-black-and-white-effect-to-a-color-video-in-ios

should check out OpenCV . It can be compiled as a static lib for the iPhone and can convert video frame by frame to grayscale or two color. You can start here . There are other resources for doing this floating around. share improve this answer..

Converting a UIImage black'n white and not grayscale for using tesseract

http://stackoverflow.com/questions/9992078/converting-a-uiimage-blackn-white-and-not-grayscale-for-using-tesseract

a UIImage black'n white and not grayscale for using tesseract I'm using tesseract in my iPhone application. I tried several filters on my image for converting it.. tesseract I'm using tesseract in my iPhone application. I tried several filters on my image for converting it to a grayscale image however I'd like to have the result where a threshold is being set so that the only pixels which are inside the image.. is being set so that the only pixels which are inside the image are black or white. I succeeded with using apples grayscale filter which gives the appropriate result. However it's still a 16 bit image correct me if I'm wrong . The filtering which..