"StephenS" <nomail@nomail> wrote in message
news:web.48b91ee5ddcc1fa02473e82c0@news.povray.org...
> "Jim Holsenback" <jho### [at] hotmail com> wrote:
>> ...
>> Is this perhaps what you are seeing? I asked (what I think) was a simular
>> question and Chris answered with this:
>>
>> >>Jim Holsenback wrote:
>> >> advanced/grenadine as a test case I noticed a difference in the
>> >> preview
>> >> window image (to dark) and the final png image file (to light).
>>
>> > Chris Cason wrote:
>> > Please be aware that the PNG output images have the inverse gamma
>> > written into the file header and will appear differently between
>> > viewers that do and don't support using this value.
>>
>> Jim
>
> Yes, but a Windows bmp file format also shows this.
>
> Stephen S
I think your Display_Gamma setting needs to be tweaked. I noticed that the
preview image and the final (png) image looked different so I changed
Display_Gamma until both images appeared the same. If I'm understanding
correctly this is similar to the process outlined in the help feature
(black/gray bars). What looks good for me may or may not look good for you
(unless we happen to have exactly the same display hardware). I've been
using Display_Gamma=2.5 on my v3.6.1 setup forever and this also worked for
the v3.7 scene files. I compared several randomly picked (NOT ALL) of the
v3.7 files with what they looked like rendered with v3.6.1 and didn't see
any difference. I then started queuing up the files and went for it. When I
was done I did a quick QA of ALL the v3.7 scene files using a slideshow type
viewer. I felt OK with the results so I thought a cursory inspection was
adequate.
Cheers Jim
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