[Radiance-general] Pvalue for converting to luminance

[Lars O. Grobe]

> Actually want to find out if there are any tools that can read out the values using psftool into text mode

I think the authors did not implement this simply because it already
exists - pvalue has been around for a while. So you could write your own
pvalue tool, in something like the pfsout-tools, but with a text format
target. Another simple way would be to combine pfsabsolute and
pfsoutppm, to create an ascii-text coded grey-scale image with linear
mapping, and read out the values than. But the accuracy would be very
bad (8bit).
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