place_lightness

io.github.RNVizion/rnv-color-mcp · Verify this server

Hold a color's hue and chroma and set its lightness, returning one result per requested L*. color accepts a hex, CSS name, RNV brand name, or saved-palette reference; lightness is a list of L* values in 0-100. This is the operation behind a LIGHT/DARK PAIR: one hue at two lightnesses, with a and b held exactly, which is how a color that works on a dark ground gets a partner that works on a light one. Use it when you need the same color at a different lightness; use mix_colors when you need a different color. Returns the source color's LAB, and for each placement the hex, the achieved LAB, and the quantization error per axis -- 8-bit hex cannot store a and b to the precision LAB expresses, so two placements of one hue differ by a few hundredths on both axes however exactly the input held them. That is the storage format, not the operation, and it is reported rather than hidden. Read-only and deterministic. Refuses rather than clamps: not every (L*, a, b) exists in sRGB, and a lightness too far from a chromatic color's range is rejected with the reason instead of being silently moved to the nearest color that fits.