I am not sure how to explain this feature well, and it might be a bit more complicated

When you take a black and white photo, you could then add color to it via a new block that takes the specific value or the crafting table.
So the black and white photo will turn this.

Into this

I'm not sure how you could do specific colors for specific value, but it can be seperated from light vs. shadow. I used gradient maps to do this.
So it would look like these.

Dedicated coloring feature is not planned currently.
But using Chromatic process you can get interesting colors for BW images.
This is what I've got while playing around with it a bit:

Also you can make Chromatic images warmer/cooler by using different shutter speeds for specific channels.

I've been trying to figure out how to do chromatic filters, but the wiki is a bit vague in it.. heh....

It's meant to be vague. I intended this feature to be somewhat hidden and some kind of a reward for curious players and for those how know about trichrome process. Probably shouldn't have put it in the wiki at all lol.

i see. well, time to see if i can find it!!1!!