Sepia Image

gistfile1.m

    //  Image processing: creating CIImage
    NSString *filename = [module.imageFilename stringByDeletingPathExtension];
    NSString *fileExtension = [module.imageFilename pathExtension];
    NSString *filePath = [[NSBundle mainBundle] pathForResource:filename ofType:fileExtension];
    NSURL *fileURL = [NSURL fileURLWithPath:filePath];
    
    CIImage *coreImage = [CIImage imageWithContentsOfURL:fileURL];
    CIContext *context = [CIContext contextWithOptions:nil];
    
    //  Image processing: applying filter
    CIFilter *filter = [CIFilter filterWithName:@"CISepiaTone"
                                  keysAndValues: kCIInputImageKey, coreImage,
                        @"inputIntensity", [NSNumber numberWithFloat:0.8], nil];
    coreImage = [filter outputImage];
    
    //  Image processing: converting CIImage to UIImage
    CGImageRef cgimg = [context createCGImage:coreImage fromRect:[coreImage extent]];
    UIImage *anImage = [UIImage imageWithCGImage:cgimg];
    imageView.image = anImage;
    
    CGImageRelease(cgimg);