A color space's white point defines what full-intensity (1,1,1) looks like in the real world

When all three RGB channels are at maximum (1,1,1), the rendered color looks white — but which chromaticity of white depends on the white point. sRGB uses D65 (average daylight), print workflows often use D50. Two color spaces with identical primaries but different white points render (1,1,1) as slightly different tints. Chromatic adaptation algorithms (Bradford matrix) shift colors between white points so conversions between D65 and D50 spaces don’t visually distort neutral colors.

Examples

sRGB white point: D65 (x=0.3127, y=0.3290). ProPhoto uses D50. Mixing sRGB and ProPhoto assets without chromatic adaptation produces a color cast.

Assessment

Two monitors both show R=G=B=1.0 but one looks slightly warm and one slightly cool. What is the likely cause, and what data would you need to correct it?