[Radiance-general] pcond -h and rpict

[Kirk Thibault]

Cool - I will try pcond -c -s and see what happens.

Thanks,

kirk

On Dec 2, 2004, at 5:44 PM, Gregory J. Ward wrote:

> Hi Kirk,
>
> Ximage using the 'h' command or the -e human option is more-or-less 
> equivalent to pcond -c -s, but the -h option of pcond turns on acuity 
> and veiling glare filters (-v and -a) that are not included in ximage. 
>  The veiling glare in particular can reduce the image contrast, 
> especially around bright sources and objects.  Also, pcond using 
> foveal-size (1 degree) luminance samples, rather than pixels, and this 
> can result in a different tone curve.
>
> -Greg (waving his hands wildly)
>
>> From: Kirk Thibault <kthibault at biomechanicsinc.com>
>> Date: December 2, 2004 2:06:07 PM PST
>>
>> Hey folks - question about the "human" exposure response in rpict 
>> (ximage) versus pcond.  When I render an image (call it "output.hdr") 
>> and display it in ximage, I hit the "h" key and the image gets 
>> redisplayed with the "human" exposure mapping.  Then i take 
>> output.hdr and i put it through
>>
>>  pcond -h output.hdr  >  output_cond.hdr
>>
>> (now call the new conditioned file "output_cond.hdr") When i display 
>> "output_cond.hdr" in ximage, i get a different resulting image than 
>> when I viewed output.hdr in ximage and hit "h".  The ximage "h" 
>> version of output.hdr is darker and has more contrast than the 
>> output_cond.hdr image.  What's up with that?
>>
>> thanks,
>>
>> kirk
>
>
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