Light
Add the light
Lights add. A warm key and a cool fill blend per channel: red with red, green with green, blue with blue. Rendering is that sum, solved at every pixel. These targets are mixes that two lamps can actually hit.
pixel = k · Key + f · Fill
Late afternoonReference pixel 155, 124, 90
0.20 × Key (255, 180, 80) + 0.20 × Fill (80, 140, 255) = (67, 64, 67)
Distance 109.0. Under 12 counts as a match.
Key amount0.20
Fill amount0.20