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Just as a check, I rendered your example SCloud_1 skysphere in v3.8xx
(assumed_gamma 1.0), and get identical results to your middle image. So far, so
good ;-)
However, I think that in v3.6 days and prior to that, there was a real
question-- not to mention a bit of confusion-- about using assumed_gamma 1.0 vs.
2.2. My own *guess* is that the SCloud_1 colors were chosen in a 2.2 gamma
environment, and that the 1st image is probably what was intended. But that's
just my gut feeling; it's very difficult to 2nd-guess someone's intention (and
working gamma space) from so long ago...not to mention having to deal with any
unknown color/gamma problems that may have existed in older versions of POV-ray
itself, which may have confused the original author.
I actually think that both the 1st AND 2nd images are pleasing-- but not the
3rd, it's too washed out. PERSONALLY, I think the appearance of these specific
sky colors should be somewhere *between* gamma 1.0 and 2.2, ha. But apparently a
2.2 gamma was what the author had in mind...so image #1 would be my pick. As a
jumping-off point, I would suggest simply changing the specified colors to srgb
versions-- no fancy conversions-- and see what it looks like at assumed_gamma
1.0.
[I also have a suspicion that some of the colors in "colors.inc" *may* have been
created for a gamma of 2.2 rather than 1.0. That's certainly debatable, of
course.]
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