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The default tiles and shaders used in Caves of Qud use 3-color tiles. Black, non-transparent pixels are painted with the foreground color, white non-transparent pixels are painted with the detail color and transparent pixels are painted with the background color.

If you'd like your mod to supply true color tiles instead of the default 3-color tiles (white, black, transparent), then include a modconfig.json in your mod's root with the Following contents.

Truecolor tiles will be shaded as their natural color, with the background color blended in at 1-alpha.

{
  "shadermode":"1"
}