.AMP File Extension
Adobe Photoshop Curves Map File
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What is an AMP file?
Adjustment curve file created by Adobe Photoshop, an image-editing application; stores a custom curve drawn by hand using the pencil tool in the Photoshop Curves window; used for saving and loading custom curve adjustments, which modify the RGB colors and tonality of an image.
To access the Curves window in Photoshop, select Image → Adjustments → Curves....
NOTE: Custom curves drawn with the Curves panel pencil tool are saved as AMP files. Curves drawn with the curve point tool are saved as .ACV files.