我只想要:
1) 复制像素数据。
2) 迭代并修改每个像素(展示如何将ARGB值作为255用NSLog输出)
3) 从新的像素数据创建UIImage
如果有人能告诉我如何将一个像素的RGBA值作为255用NSLog输出,那我就可以自己详细了解。请告诉我如何修改以下代码以实现此目的。请具体说明!
-(UIImage*)modifyPixels:(UIImage*)originalImage
{
NSData* pixelData = (NSData*)CGDataProviderCopyData(CGImageGetDataProvider(originalImage.CGImage));
uint myLength = [pixelData length];
for(int i = 0; i < myLength; i += 4) {
//CHANGE PIXELS HERE
/*
Sidenote: Just show me how to NSLog them
*/
//Example:
//NSLog(@"Alpha 255-Value is: %u", data[i]);
//NSLog(@"Red 255-Value is: %u", data[i+1]);
//NSLog(@"Green 255-Value is: %u", data[i+2]);
//NSLog(@"Blue 255-Value is: %u", data[i+3]);
}
//CREATE NEW UIIMAGE (newImage) HERE
return newImage;
}