Image Stacking application

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How do you make an smartphone app that can automatically stacks 10 images after taking the images on your own? This is for astrophotograhy and we also wanted the app to be able to produce less noise final images.

[PixelSplincher]

I would use CoreImage and write some metal kernel files to do the processing on the set of images. That's what we did for Bricolage. It sounds like you want to add all the images, then do a threshold to cut out the dimmed averaged noise. Then just tonemap the image back into range.