otacon239/inksplit — reverse-engineered prompt

Build me a GIMP plug in for screen printing color separations.

I want to open a raster design on a transparent background, choose either a fixed palette or just tell it how many colors I want, and have it reduce the artwork to those colors and split each color into its own layer automatically. It should also handle practical print setup stuff like canvas size, DPI, margins, print location, center and vertical offsets, max width and height scaling, autocrop, dithering for gradients and transparency, and optional white underbase generation with a threshold for skipping darker colors.

Please add registration marks and labels for each separated layer, and support best fit color matching so it can rename layers based on a selected palette such as Pantone style palettes. Accurate color matching matters here. The export all layers feature can stay clearly marked as not working for now if needed.

Make it feel usable inside GIMP under the Filters menu, with a simple options window. Look up current GIMP Python plug in docs online if you need to.