Gradient domain compositing

There are a great many advanced image based tasks that can be accomplished in gradient domain instead of regular RGB color space, but the process of converting the gradient back to color space appears non-trivial.

https://en.wikipedia.org/wiki/Gradient-domain_image_processing
http://cs.brown.edu/courses/cs129/results/proj2/njooma/
http://grail.cs.washington.edu/projects/gradientshop/

No source files, tests, or entry points are mentioned. Start by reviewing the linked gradient-domain image-processing resources, then define a concrete scope and acceptance criteria for the proposed topic; done requires an agreed implementation target rather than the current broad research suggestion.

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