gradientmap: Support background color

imgflo / imgflo-server

HTTP image processing server based on imgflo

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gradientmap: Support background color #39

Open jonnor opened 9 years ago

jonnor commented 9 years ago

Basically the input image will be composited first against the background, then a gradient map is composed on top. Background would be specified as a color argument. Does this require two opacity options??