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Before, it worked by scaling all the colour components, which worked reasonably for colours in the vicinity of white, but failed badly on a black background. Now it generates the highlight and lowlight colours by mixing the background colour with white and black respectively. Where there isn't enough headroom, it adjusts the background by mixing in a negative amount of white or black, which makes sense geometrically if not in paint. There is still a problem that green and yellow colours don't end up with bright enough highlights. I think this is because the code doesn't understand that green is brighter than red or blue.
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.