2014/10/15 下午 10:05:00

iphone Programming Glossary: cgcolorspacecreatedevicegray

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

0 CFDataSetLength dataBuffer bufferSize the data will be 8 bits per pixel no alpha CGColorSpaceRef colourSpace CGColorSpaceCreateDeviceGray CGContextRef ctx CGBitmapContextCreate CFDataGetMutableBytePtr dataBuffer maskWidth maskHeight 8 bytesPerRow colourSpace..

matchTemplate opencv not working as shown in opencv document

http://stackoverflow.com/questions/12049358/matchtemplate-opencv-not-working-as-shown-in-opencv-document

dataWithBytes cvMat.data length cvMat.elemSize cvMat.total CGColorSpaceRef colorSpace if cvMat.elemSize 1 colorSpace CGColorSpaceCreateDeviceGray else colorSpace CGColorSpaceCreateDeviceRGB CGDataProviderRef provider CGDataProviderCreateWithCFData __bridge CFDataRef..

OpenCV install in xcode

http://stackoverflow.com/questions/12214273/opencv-install-in-xcode

Extracting images from a PDF

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

CGColorSpaceCreateWithName kCGColorSpaceGenericCMYK spp 4 else if strcmp colorSpaceName DeviceGray 0 cgColorSpace CGColorSpaceCreateDeviceGray CGColorSpaceCreateWithName kCGColorSpaceGenericGray spp 1 else if bps 1 if there's no colorspace entry there's still one.. spp 1 else if bps 1 if there's no colorspace entry there's still one we can infer from bps cgColorSpace CGColorSpaceCreateDeviceGray colorSpace NSDeviceBlackColorSpace spp 1 decodeValues decodeValuesFromImageDictionary dict cgColorSpace bps int rowBits..

Load image from photo library

http://stackoverflow.com/questions/3333652/load-image-from-photo-library

UIImagePickerControllerOriginalImage this image we get from UIImagePickerController CGColorSpaceRef colorSapce CGColorSpaceCreateDeviceGray CGContextRef context CGBitmapContextCreate nil originalImage.size.width originalImage.size.height 8 originalImage.size.width..

Convert Image to B&W problem CGContext - iPhone Dev

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

CGRect imageRect CGRectMake 0 0 image.size.width image.size.height Grayscale color space CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceGray Create bitmap content with current image size and grayscale colorspace CGContextRef context CGBitmapContextCreate nil image.size.width.. CGRect imageRect CGRectMake 0 0 image.size.width image.size.height Grayscale color space CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceGray Create bitmap content with current image size and grayscale colorspace CGContextRef context CGBitmapContextCreate nil image.size.width..

clipping a UIImage as per a polygon

http://stackoverflow.com/questions/3667939/clipping-a-uiimage-as-per-a-polygon

the clipped image data the context would probably be a CGBitmapContext something like this CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceGray size_t bytesPerPixel 1 size_t bytesPerRow bmpWidth bytesPerPixel size_t bmpDataSize bytesPerRow bmpHeight unsigned char..

Create layer mask with custom-shaped hole

http://stackoverflow.com/questions/5721196/create-layer-mask-with-custom-shaped-hole

self addSprite spr CGRect r spr boundingBox CGSize sz CGSizeMake r.size.width r.size.height CGColorSpaceRef colorSpace CGColorSpaceCreateDeviceGray CGContextRef context CGBitmapContextCreate NULL w h 8 0 colorSpace kCGBitmapByteOrderDefault kCGImageAlphaNone CGColorSpaceRelease..

iOS - How to achieve emboss effect for the text on UILabel?

http://stackoverflow.com/questions/8467141/ios-how-to-achieve-emboss-effect-for-the-text-on-uilabel

font size CGSize size CGRect rect CGPointZero size CGFloat scale UIScreen mainScreen .scale CGColorSpaceRef grayscale CGColorSpaceCreateDeviceGray CGContextRef gc CGBitmapContextCreate NULL size.width scale size.height scale 8 size.width scale grayscale kCGImageAlphaOnly..