This modifies the previous support for grayscale and LMS-based simulation for protanopia and deuteranopia, bringing it in line with the methodology currently used in Chromium and Firefox. QGIS now uses updated grayscale luminance calculations (renamed to achromatopsia), a precomputed protanopia matrix (renamed from protanope), a precomputed deuteranopia matrix (renamed from deuteranope), and an additional mode for tritanopia using a similarly precomputed matrix.
This feature was developed by Will Cohen