POV-Ray : Newsgroups : povray.binaries.images : IRTC detail shot : Re: IRTC detail shot Server Time
5 Nov 2024 03:16:52 EST (-0500)
  Re: IRTC detail shot  
From: Robert McGregor
Date: 2 Nov 2009 23:20:01
Message: <web.4aefade9b57c8bb34726e92b0@news.povray.org>
One thing I forgot to mention that I struggled with is differences in display
gamma, which can really yield a HUGE difference in the *perceived* image output.

I'm told it affects antialiasing too somehow, but... well I must admit that all

good for compositing" and "Windows is 2.2" and "Mac is 1.6" (or something like
that). Whatever. I've seen Warp and Clipka going back and forth about it over
the last few months...

Anyway, I did a lot of test renders and my final density_map values for the
glowing wires media (for all layers of media) were:

   density_map {
      [0 rgb 0]
      [0.5 rgb <0.625, 0.156, 0>*6]
      [0.7 rgb <0.625, 0.304, 0.127>/1.2*6]
      [1 rgb 1]
   }

Here are three renders of the exact same scene file but with, respectively,
default gamma (i.e., no command line gamma), Display_Gamma=1.6, and
Display_Gamma=1.0. I'm not sure why a command line Display_Gamma of 1.0 looks
*completely* different than the supposed default 1.0 gamma for POV-Ray 3.7
[i.e., without any Display_Gamma in the command line])? I guess I really just

file images are identical, but this "display" thing really throws me off, since
all are quite different.

This is one area where I can truly appreciate Jaime Vives Piqueres' ignorancia
mindset... I know what looks good to me, so I adjust according to what I think
looks right (and if it looks right, it *is* right!)

Well, the Display_Gamma=1.0 looks a bit dark, but nice and rich to me in the
render preview, so I just adjust all the other materials and lighting
accordingly to fit with that. Then I have to go into PhotoShop and adjust the
levels on the disk file image until it actually looks like the Display_Gamma=1
render preview window... I feel like there's some mystical something
simple/vital/wonderful I'm missing here in regard to this gamma stuff to make my
art better, stronger, faster  -easier... If someone could explain it I'd really
appreciate it :D

Thanks,
Rob


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