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2014/10/15 ¤U¤È 10:13:08
iphone Programming Glossary: rawimagerefWhy is CGImageCreateWithMaskingColors() returning nil in this case? http://stackoverflow.com/questions/3563770/why-is-cgimagecreatewithmaskingcolors-returning-nil-in-this-case returning nil in this case When I 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.. 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 share improve..
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 UIImage viewImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext CGImageRef rawImageRef viewImage.CGImage const float colorMasking 6 255 255 255 255 0 0 CGImageCreateWithMaskingColors rawImageRef colorMasking.. 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 like to have.. 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 be transparent on the places where it's white by using..
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