WEBVTT

00:00:00.650 --> 00:00:04.330
Halfway between black and white is not
always the gray you expect.

00:00:04.850 --> 00:00:09.050
In a typical image, stored color values
are encoded for display.

00:00:09.610 --> 00:00:12.075
Averaging those values can give a darker

00:00:12.090 --> 00:00:14.690
result than averaging the underlying
light.

00:00:15.430 --> 00:00:20.610
That difference matters when you blur an
image, blend layers, or build a glow.

00:00:21.010 --> 00:00:25.390
A transition can look muddy even when the
arithmetic seems correct.

00:00:26.310 --> 00:00:28.770
The fix starts before the effect.

00:00:29.280 --> 00:00:32.800
Convert color into a linear working space,

00:00:32.940 --> 00:00:38.180
perform the calculation there, then
transform the result for display.

00:00:38.700 --> 00:00:44.140
Keep data maps, like roughness and
normals, separate from color textures;

00:00:44.580 --> 00:00:48.480
they represent instructions, not
photographed light.

00:00:49.160 --> 00:00:52.720
Color management cannot rescue every
artistic choice.

00:00:53.130 --> 00:00:56.075
But it gives your tools a consistent
foundation,

00:00:56.090 --> 00:01:01.690
so you can judge the image instead of
fighting a hidden math problem.