How to change the luminosity or contrast of an image in an android app?

  

I m using Delphi Firemonkey (but I have access to the android java framework) and I would like to know if there is any way to let the user to change the contrast and the luminosity of the image they made before they send it to our server?

I can do it easily using OpenGL texture + filter but the problem I don’t know how to save the resulting texture 🙁

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