modify pixels of an CGImageRef
I am using the following code to modify pixels of an image. The issue I have is the color of the images are icorrect. Do you have any idea of the issue?
CGImageRef inImage = img.CGImage;
CGContextRef ctx;
CFDataRef m_DataRef;
m_DataRef = CGDataProviderCopyData(CGImageGetDataProvider(inImage));
UInt8 * m_PixelBuf = (UInt8 *) CFDataGetBytePtr(m_DataRef);
开发者_开发技巧// Byte tmpByte;
int length = CFDataGetLength(m_DataRef);
for (int index = 0; index < length; index += 4)
{
// DO Stuff
}
ctx = CGBitmapContextCreate(m_PixelBuf,
CGImageGetWidth( inImage ),
CGImageGetHeight( inImage ),
8,
CGImageGetBytesPerRow( inImage ),
CGImageGetColorSpace( inImage ),
kCGImageAlphaPremultipliedFirst );
CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
UIImage* rawImage = [UIImage imageWithCGImage:imageRef];
CGContextRelease(ctx);
Try using kCGImageAlphaPremultipliedLast instead of kCGImageAlphaPremultipliedFirst.
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