我正在尝试使用CIFilter在图像上应用各种效果(亮度,对比度,饱和度等) .
图像过滤器已成功应用 . 但是不保持编辑的最后一个图像状态,例如: if I increase brightness of image and then apply contrast to the edited image, then the contrast is applied to original image instead of being applied to the brightness increased image
以下是代码:
- (IBAction)contrastSliderValueChanged:(id)sender {
filter=NULL;
result=NULL;
cgimg=NULL;
newimg=NULL;
if (adjustMenuTag==1) {
filter=[CIFilter filterWithName:@"CIColorControls"];
[filter setDefaults];
[filter setValue:beginImage forKey:@"inputImage"];
[filter setValue:[NSNumber numberWithFloat:contrastSlider.value] forKey:@"inputBrightness"] ;
result=[filter valueForKey:kCIOutputImageKey];
cgimg=[context createCGImage:result fromRect:[result extent]];
newimg=[UIImage imageWithCGImage:cgimg];
imageViewDisplay.image=newimg;
beginImage = result;
CFRelease(cgimg);
// beginImage = [[CIImage alloc] initWithImage:imageViewDisplay.image];
} else if(adjustMenuTag ==2 ) {
filter=[CIFilter filterWithName:@"CIColorControls"];
[filter setDefaults];
[filter setValue:beginImage forKey:@"inputImage"];
[filter setValue:[NSNumber numberWithFloat:contrastSlider.value+0.5] forKey:@"inputContrast"] ;
result=[filter valueForKey:kCIOutputImageKey];
cgimg=[context createCGImage:result fromRect:[result extent]];
newimg=[UIImage imageWithCGImage:cgimg];
imageViewDisplay.image=newimg;
beginImage = result;
CFRelease(cgimg);
// beginImage = newimg.CIImage; //this also doesn't work.
}
}
我哪里错了?我该如何解决这个问题?如何维护编辑图像的状态?
1 回答
查看代码,每次选择菜单项时,您似乎都在创建CIColorControls过滤器的新实例 . 您应该创建一个,保留它,并根据需要更新其输入 .