Monocolor and thresholds

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tomczak
Posts: 661
Joined: April 25th, 2009, 12:56 am

Monocolor and thresholds

Postby tomczak » June 13th, 2013, 9:36 am

Would anybody know how Monocolor actually works? What are the thresholds that determine what's colour, what's gray? I experimented on test image a bit, and it appears that if the chosen RBG channel has a higher value that the other two, it retains some saturation, but I'm still not sure if this is true.

Also, what would be a good preprocessing idea before Monocolor, to influence what's included in the 'color' part and what becomes pure gray?
Maciej Tomczak
Phototramp.com

jsachs
Posts: 780
Joined: January 22nd, 2009, 11:03 pm

Re: Monocolor and thresholds

Postby jsachs » June 13th, 2013, 12:10 pm

Monocolor attempts to render the image as accurately as possible using just varying amounts of white and the selected color and preserving luminance. The math - taken from a technical journal - is a little complicated and there are no thresholds as such.
Jonathan Sachs
Digital Light & Color


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