Question

我想使用滑块更改图像的色调。我做的是：

float slideValue =  sldHueChange.value;
beginImage= [CIImage imageWithCGImage:imgBorder.image.CGImage];
context = [CIContext contextWithOptions:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:kCIContextUseSoftwareRenderer]];
filter= [CIFilter filterWithName:@"CIHueAdjust"];
[filter setValue:beginImage forKey:kCIInputImageKey];
[filter setValue:[NSNumber numberWithFloat:slideValue] forKey:@"inputAngle" ];
CIImage *outputImage = [filter outputImage];
CGImageRef cgimg =[context createCGImage:outputImage fromRect:[outputImage extent]];
UIImage *newImg = [UIImage imageWithCGImage:cgimg];
[imgBorder setImage:newImg];
CGImageRelease(cgimg);

它的工作。但它并不顺利。我希望能够非常顺利地改变图像的色调。如果您有想要制作平滑的色调变换器，请分享。我真的需要它。提前谢谢。

Answer 1

我建议你使用Brad的惊人GPUImage，它有很多过滤器，或者你可以尝试使用CIContext的GPU渲染，在CIContext的选项字典中将布尔值更改为NO创建

Answer 2

现在我正在做的是：

CGRect rect = CGRectMake(0, 0, selectedBorderForChangingHue.size.width, selectedBorderForChangingHue.size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context1 = UIGraphicsGetCurrentContext();
CGContextClipToMask(context1, rect, selectedBorderForChangingHue.CGImage);
CGContextSetFillColorWithColor(context1, [[UIColor colorWithHue:sldHueChange.value/255.0f saturation:1.0f brightness:1.0f alpha:1.0f] CGColor]);
CGContextFillRect(context1, rect);
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImage *flippedImage = [UIImage imageWithCGImage:img.CGImage scale:1.0 orientation: UIImageOrientationDownMirrored];
imgBorder.image = flippedImage;

它对我来说很好。而且很顺利。

更改图像色调iOS

2 个答案: