Core Image 旧胶片效果
30 Mar 2014下面是实现一个带燥点的旧胶片效果的处理流程
- 首先用 CISepiaTone 生成单色旧胶片的图像
- 然后生成一张白色燥点的遮罩图片
- 然后生成一张黑色划痕燥点的遮罩图片，来体现胶片磨损的效果
- 最后把三张图片合成在一起
首先来单色照片
CIFilter *sepiaToneFilter = [CIFilter filterWithName:@"CISepiaTone"];
[sepiaToneFilter setValue:myImage forKey:kCIInputImageKey];
生成白色燥点遮罩然后跟单色的照片合成在一起
CIFilter *randomFilter = [CIFilter filterWithName:@"CIRandomGenerator"];
CIFilter *colorFilter = [CIFilter filterWithName:@"CIColorMatrix"];
[colorFilter setValue:randomFilter.outputImage forKey:kCIInputImageKey];
CIVector *vector = [CIVector vectorWithX:0 Y:1 Z:0 W:0];
[colorFilter setValue:vector forKey:@"inputRVector"];
[colorFilter setValue:vector forKey:@"inputGVector"];
[colorFilter setValue:vector forKey:@"inputBVector"];
[colorFilter setValue:[CIVector vectorWithX:0 Y:0 Z:0 W:0.1] forKey:@"inputAVector"];
CIFilter *compositingFilter = [CIFilter filterWithName:@"CIAdditionCompositing"];
[compositingFilter setValue:colorFilter.outputImage forKey:kCIInputImageKey];
[compositingFilter setValue:sepiaToneFilter.outputImage forKey:kCIInputBackgroundImageKey];
生成黑色划痕遮罩 然后在合成在一起
CIImage *maskImage = [randomFilter.outputImage imageByApplyingTransform:CGAffineTransformMakeScale(10, 45)];
CIFilter *colorFilter2 = [CIFilter filterWithName:@"CIColorMatrix"];
[colorFilter2 setValue:maskImage forKey:kCIInputImageKey];
CIVector *vector2 = [CIVector vectorWithX:0 Y:0 Z:0 W:0];
[colorFilter2 setValue:[CIVector vectorWithX:6 Y:0 Z:0 W:0] forKey:@"inputRVector"];
[colorFilter2 setValue:vector2 forKey:@"inputGVector"];
[colorFilter2 setValue:vector2 forKey:@"inputBVector"];
[colorFilter2 setValue:vector2 forKey:@"inputAVector"];
[colorFilter2 setValue:[CIVector vectorWithX:0 Y:1 Z:1 W:1] forKey:@"inputBiasVector"];
CIFilter *blackFilter = [CIFilter filterWithName:@"CIMinimumComponent"];
[blackFilter setValue:colorFilter2.outputImage forKey:kCIInputImageKey];
CIFilter *compositingFilter2 = [CIFilter filterWithName:@"CIMultiplyCompositing"];
[compositingFilter2 setValue:blackFilter.outputImage forKey:kCIInputImageKey];
[compositingFilter2 setValue:compositingFilter.outputImage forKey:kCIInputBackgroundImageKey];