2014/10/15 下午 10:05:04

iphone Programming Glossary: cgimagecreatewithmaskingcolors

http://stackoverflow.com/questions/10708656/changing-color-space-on-and-image

over the pixels in the loop iphone objective c ios core graphics quartz graphics share improve this question Use CGImageCreateWithMaskingColors and CGContextSetRGBFillColor together like this CGImageRef myMaskedImage const CGFloat myMaskingColors 6 0 124 0 68 0 0.. together like this CGImageRef myMaskedImage const CGFloat myMaskingColors 6 0 124 0 68 0 0 myColorMaskedImage CGImageCreateWithMaskingColors image myMaskingColors CGContextSetRGBFillColor myContext 0.6373 0.6373 0 1 CGContextFillRect context rect CGContextDrawImage..

iPhone development: pointer being freed was not allocated

http://stackoverflow.com/questions/1424210/iphone-development-pointer-being-freed-was-not-allocated

unmasked CGBitmapContextCreateImage context2 const float myMaskingColorsFrameColor 6 1 256 1 256 1 256 CGImageRef mask CGImageCreateWithMaskingColors unmasked myMaskingColorsFrameColor CGContextSetRGBFillColor context 256 256 256 1 CGContextFillRect context rect CGContextDrawImage..

UIImage change raw pixels from white to clear?

http://stackoverflow.com/questions/2650456/uiimage-change-raw-pixels-from-white-to-clear

by an image that somehow doesn't work with your code or by an OS upgrade changing how the CGImage gets created. The CGImageCreateWithMaskingColors function suggested on one of the other questions you linked to is the correct solution. One thing that's tripping you up..

Why is CGImageCreateWithMaskingColors() returning nil in this case?

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

is CGImageCreateWithMaskingColors returning nil in this case When I use the following code UIImage image UIImage imageNamed @ loginf1.png CGImageRef rawImageRef.. CGImageRef rawImageRef image.CGImage const 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..

How to make one color transparent on a UIImage?

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

@ 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 imageWithCGImage New CGImageRef createMask UIImage temp CGImageRef ref temp.CGImage..

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 rawImageRef However my Image only turns white and I'd.. float colorMasking 6 255 255 255 255 255 255 UIGraphicsBeginImageContext viewImage.size CGImageRef maskedImageRef CGImageCreateWithMaskingColors rawImageRef colorMasking CGContextTranslateCTM UIGraphicsGetCurrentContext 0.0 viewImage.size.height CGContextScaleCTM UIGraphicsGetCurrentContext..