[Radiance-general] pcomb to change pixel brightness values

[Greg Ward]

Hi Chris,

Easy enough:

	pcomb -e 'Rs:.353;Gs:.915;Bs:.081' -e 'Lt:1000/WE' -e 'over=li(1)-Lt' \
		-e 'ro=if(over,Rs,ri(1));go=if(over,Gs,gi(1));bo=if(over,Bs,bi(1))'  -o input.hdr > output.hdr

I've arbitrarily set your special color to RGB=(.353,.915,.081) and the threshold to 1000 cd/m^2.

Cheers,
-Greg

> From: Humann Chris <chris at coolshadow.com>
> Date: March 1, 2013 1:18:26 PM PST
> 
> Dear list,
> 
> Once again I'm stuck scratching my head over pcomb functional syntax.  
> 
> I'd like to be able to modify an HDR image such that any pixel of a specific brightness li(n)  is changed to a specific color of a given value and the original pixel values are maintained for all the other pixels below the brightness threshold.
> 
> As always thanks,
> Chris
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