[action] Warm Up action

Registered by Stani on 2010-02-23

I really do not remember the source of the algorithm. I have developed
it some time ago for my wife (she is a photographer) for mass-conversion
of assignment photos. I suspect I thought out the formula myself - maybe
based on something i have red. I really do not remember.
The idea is really simple:

- Take some colour from the palette. This will be basically the tint you
add to the mid-tones of your picture.
- Find difference between its channels and the 50% grey, optionally
adding some brightening factor (c[l]-0.5+b)
- Convert image to grey-scale
- Shift the channels in such a way that 50% grey becomes tinted in the
same proportions as your selected colour, while keeping the whites and
blacks intact (using x + m*x(1-x) function)
- Optionally mix with original image.

Blueprint information

Status:
Complete
Approver:
Stani
Priority:
Low
Drafter:
Paweł T. Jochym
Direction:
Approved
Assignee:
Paweł T. Jochym
Definition:
Approved
Series goal:
Accepted for 0.2
Implementation:
Implemented
Milestone target:
milestone icon 0.2.6
Started by
Stani on 2010-02-23
Completed by
Stani on 2010-02-23

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