2014/10/15 下午 10:11:19

iphone Programming Glossary: maskedimageref

Why is CGImageCreateWithMaskingColors() returning nil in this case?

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

@ loginf1.png 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.. 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 I had..

How to Mask an UIImageView

http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview

CGImageGetBitsPerPixel maskRef CGImageGetBytesPerRow maskRef CGImageGetDataProvider maskRef NULL false CGImageRef maskedImageRef CGImageCreateWithMask image CGImage mask UIImage maskedImage UIImage imageWithCGImage maskedImageRef CGImageRelease mask.. false CGImageRef maskedImageRef CGImageCreateWithMask image CGImage mask UIImage maskedImage UIImage imageWithCGImage maskedImageRef CGImageRelease mask CGImageRelease maskedImageRef returns new image with mask applied return maskedImage After you provided.. image CGImage mask UIImage maskedImage UIImage imageWithCGImage maskedImageRef CGImageRelease mask CGImageRelease maskedImageRef returns new image with mask applied return maskedImage After you provided your code I have added some numbers as comments..

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

const float colorMasking 6 255 255 255 255 255 255 UIGraphicsBeginImageContext viewImage.size CGImageRef maskedImageRef CGImageCreateWithMaskingColors rawImageRef colorMasking CGContextTranslateCTM UIGraphicsGetCurrentContext 0.0 viewImage.size.height.. 1.0 1.0 CGContextDrawImage UIGraphicsGetCurrentContext CGRectMake 0 0 viewImage.size.width viewImage.size.height maskedImageRef UIImage newImage UIGraphicsGetImageFromCurrentImageContext CGImageRelease maskedImageRef UIGraphicsEndImageContext share..