Color consistency algorithms python

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Hey folks,

I'm working on forgery detection (pixel and edge-based Color Estimation) there are some algorithms which work well.

1) gray world

2) max RGB

3) shades of gray

4) first-order Gray edge

5) Second-order Gray edge

6) Weighted Gray-Edge

7) Illuminant Map

I've implemented the first 2 ( gray world, max RGB). Does anyone know OpenCV implementation of remaining algorithms? & I'm also confused between the first-order edge and first-order grey edge these 2 terms/algo are same?