GPU Image Framework X-ray Effect [closed]

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I am making a application that you can apply different effects to photos using GPU Image Framework by Brad Larson.I want to add X-ray Effect filter in GPU image app.Any pointers will be appreciated

Answer 1

You want something like the GPUImageColorInvertFilter:

If that doesn't produce the exact effect you want, you could create a custom filter based on it and have your fragment shader first convert to luminance, and then apply a greenish tint based on the inverse of the pixel's luminance. That would provide the exact effect you show above.

I'll leave the coding of such a shader as an exercise for the reader.