我还有另一个 quartz 2d (iphone) 问题:
如何将 ImageView 的所有颜色更改为黑白并仅保留红色???
DD
最佳答案
UIImage *originalImage = [info objectForKey:UIImagePickerControllerOriginalImage]; this image we get from UIImagePickerController
CGColorSpaceRef colorSapce = CGColorSpaceCreateDeviceGray();
CGContextRef context = CGBitmapContextCreate(nil, originalImage.size.width, originalImage.size.height, 8, originalImage.size.width, colorSapce, kCGImageAlphaNone);
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
CGContextSetShouldAntialias(context, NO);
CGContextDrawImage(context, CGRectMake(0, 0, originalImage.size.width, originalImage.size.height), [originalImage CGImage]);
CGImageRef bwImage = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSapce);
UIImage *resultImage = [UIImage imageWithCGImage:bwImage]; // This is result B/W image.
CGImageRelease(bwImage);
这是我在其他论坛上找到的东西,它似乎有效!!!
关于iphone - 将图像设为黑白?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3521261/