[HDRI] ximage and hdri

[Jack de Valpine]

Hi Roberto,

Radiance is open source and is available at www.radiance-online.org. The 
program "ximage" is part of the Radiance tool set. Rather than hacking 
ximage source code there may be other ways to calculate the average 
luminances that want. For example it is possible to read in values from 
an image on a per pixel basis, depending on what you are trying to 
accomplish this could be coupled with an image mask to sample only 
selected pixels.

Regards,

-Jack de Valpine


Roberto Rodriguez wrote:
> I´m a PhD student from Argentina, member of a research team advocated to
> the study of natural lighting. We are exploring the HRDI technique and we
> found a limitation while using hdrgen and ximage: Only squared shapes are
> avaiable to average Luminances, and we need to calculate the mean
> Luminances for radial shapes (circular, toroidal) in order to get the
> luminance contrast in the field of view.
>
> How can we overcome this? Can we "borrow" the source code of ximage so we
> can write a script acording to our needs?
> Thank you.
>
>   


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# Jack de Valpine
# president
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# visarc incorporated
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