我已经看到了饱和度的实现代码,我发现它非常好。但我想以这种方式实现色调。
饱和度代码 -
void filterSaturate(UInt8 *pixelBuf, UInt32 offset, void *context)
{
double t = *((double*)context);
int r = offset;
int g = offset+1;
int b = offset+2;
int red = pixelBuf[r];
int green = pixelBuf[g];
int blue = pixelBuf[b];
int avg = ( red + green + blue ) / 3;
pixelBuf[r] = SAFECOLOR((avg + t * (red - avg)));
pixelBuf[g] = SAFECOLOR((avg + t * (green - avg)));
pixelBuf[b] = SAFECOLOR((avg + t * (blue - avg)));
}
答案 0 :(得分:1)
以下是重要的代码,取自Alex Stone的回答here:
-(UIImage*)doHueAdjustFilterWithBaseImageName:(NSString*)baseImageName hueAdjust:(CGFloat)hueAdjust
{
CIImage *inputImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:baseImageName]];
CIFilter * controlsFilter = [CIFilter filterWithName:@"CIHueAdjust"];
[controlsFilter setValue:inputImage forKey:kCIInputImageKey];
[controlsFilter setValue:[NSNumber numberWithFloat:hueAdjust] forKey:@"inputAngle"];
NSLog(@"%@",controlsFilter.attributes);
CIImage *displayImage = controlsFilter.outputImage;
UIImage *finalImage = [UIImage imageWithCIImage:displayImage];
CIContext *context = [CIContext contextWithOptions:nil];
if (displayImage == nil || finalImage == nil) {
// We did not get output image. Let's display the original image itself.
return [UIImage imageNamed:baseImageName];
}else {
// We got output image. Display it.
return [UIImage imageWithCGImage:[context createCGImage:displayImage fromRect:displayImage.extent]];
}
}
非常整洁,很容易看到正在发生的事情,完成工作。