2014/10/15 下午 10:05:13

iphone Programming Glossary: colormasking

Why is CGImageCreateWithMaskingColors() returning nil in this case?

http://stackoverflow.com/questions/3563770/why-is-cgimagecreatewithmaskingcolors-returning-nil-in-this-case

use the following code UIImage image UIImage imageNamed @ loginf1.png CGImageRef rawImageRef image.CGImage const float colorMasking 6 222 255 222 255 222 255 CGImageRef maskedImageRef CGImageCreateWithMaskingColors rawImageRef colorMasking maskedImageRef.. float colorMasking 6 222 255 222 255 222 255 CGImageRef maskedImageRef CGImageCreateWithMaskingColors rawImageRef colorMasking maskedImageRef is always nil. Why is this and what can I do to correct this iphone core graphics share improve this question..

How to make one color transparent on a UIImage?

http://stackoverflow.com/questions/633722/how-to-make-one-color-transparent-on-a-uiimage

void changeColor UIImage temp23 UIImage imageNamed @ leaf.png CGImageRef ref1 self createMask temp23 const float colorMasking 6 1.0 2.0 1.0 1.0 1.0 1.0 CGImageRef New CGImageCreateWithMaskingColors ref1 colorMasking UIImage resultedimage UIImage.. temp23 const float colorMasking 6 1.0 2.0 1.0 1.0 1.0 1.0 CGImageRef New CGImageCreateWithMaskingColors ref1 colorMasking UIImage resultedimage UIImage imageWithCGImage New CGImageRef createMask UIImage temp CGImageRef ref temp.CGImage int mWidth..

How can I change the color 'white' from a UIImage to transparent

http://stackoverflow.com/questions/9458303/how-can-i-change-the-color-white-from-a-uiimage-to-transparent

UIGraphicsEndImageContext CGImageRef rawImageRef viewImage.CGImage const float colorMasking 6 255 255 255 255 0 0 CGImageCreateWithMaskingColors rawImageRef colorMasking UIImage newImage UIImage imageWithCGImage.. viewImage.CGImage const float colorMasking 6 255 255 255 255 0 0 CGImageCreateWithMaskingColors rawImageRef colorMasking UIImage newImage UIImage imageWithCGImage rawImageRef However my Image only turns white and I'd like to have the image to.. UIGraphicsEndImageContext CGImageRef rawImageRef viewImage.CGImage const float colorMasking 6 255 255 255 255 255 255 UIGraphicsBeginImageContext viewImage.size CGImageRef maskedImageRef CGImageCreateWithMaskingColors..