从Photoshop到iOS的颜色特定的色相/饱和度 [英] Color Specific Hue/Saturation from Photoshop to iOS

问题描述

我正在尝试使用GPUImage和CIFilter映射此过滤器。请注意，我需要帮助将特定颜色（红色）（注意：不是主色，只是红色）的photoshop元素映射到iOS。

I'm trying to use GPUImage and CIFilter to map this filter. Please note, I need help mapping the color (Reds) specific (note: NOT Master, just Reds) photoshop element to iOS.

有人知道如何操纵CIFilter吗？或GPUImage类在iOS中获得以下Photoshop效果？

Does anyone know how to manipulate a CIFilter or GPUImage class to get the photoshop effect below in iOS?

推荐答案

您可以将GPUImage与查找过滤器一起使用：

You could use GPUImage with the lookup filter:

GPUImageLookupFilter：使用RGB颜色查找图像重新映射图像中的
颜色。首先，使用您喜欢的照片编辑
应用程序将滤镜从
GPUImage / framework / Resources应用于lookup.png。为了使其正常工作，每个像素
的颜色不得依赖于其他像素（例如，模糊将不起作用）。如果
您需要更复杂的过滤器，则可以创建所需
一样多的查找表。准备就绪后，将新的lookup.png文件用作GPUImageLookupFilter的第二个输入
。

GPUImageLookupFilter: Uses an RGB color lookup image to remap the colors in an image. First, use your favourite photo editing application to apply a filter to lookup.png from GPUImage/framework/Resources. For this to work properly each pixel color must not depend on other pixels (e.g. blur will not work). If you need a more complex filter you can create as many lookup tables as required. Once ready, use your new lookup.png file as a second input for GPUImageLookupFilter.

因此，在在Photoshop中将GPUImage中的lookup.png文件保存起来，然后应用滤镜：

So apply all color filters in the lookup.png file from GPUImage in Photoshop, save it, then apply the filter:

- (UIImage *)applyMyFilter:(UIImage*)inputImage {
    //apply custom filter
    GPUImagePicture *stillImageSource = [[GPUImagePicture alloc] initWithImage:inputImage];

    GPUImagePicture *lookupImageSource = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:@"my-lookup.png"]];
    GPUImageLookupFilter *lookupFilter = [[GPUImageLookupFilter alloc] init];
    [stillImageSource addTarget:lookupFilter];
    [lookupImageSource addTarget:lookupFilter];

    [stillImageSource processImage];
    [lookupImageSource processImage];
    UIImage *adjustedImage = [lookupFilter imageFromCurrentlyProcessedOutput];

    return adjustedImage;
}

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