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Gamma... again. Frame buffer.

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15 years 9 months ago #1051 by thomas_f
I'm getting inconsistent behavior in the frame buffer window since I installed 075. If I render an image having checked the gamma option, the image will render fine into the Max frame buffer. When the image is ready I sometimes zoom in the frame buffer window to check some detail. What happens then is that, sometimes, the gamma value in the VFB changes abruptly. Colors become washed out and so on. Why is that, and what can I do to make it stop? It's very annoying, and the strange thing is that, again sometimes, this behavior started happening using the SR_B052 aswell - but only after having installed the SR_B075. Before that I can't recall having had any serious problems.

I still maintain that this gamma issue is a pain in the posterior. Personally I was happier when we didn't have to bother with it.

T

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15 years 9 months ago #1053 by subburb
Hi, Thomas,

I know this is a problematic point. it's some kind of limitation dur to the max frame buffer. if i remember well it was same in 0.52n depends of your max internal gamma settings.
Of course this problems disappear when using Vray VFB.

Let's say you're working with gamma 2.2 value in SR:
While working on your project, max display gamma and max bitmap input gamma is set to 2.2 by solidrocks, to match the gamma 2.2.
when you render, SR temporary set the max display gamma to 1.0, and force vray gamma (color mapping section) to 2.2 to make the render with correct gamma.
technically it's the only way to have a constant gamma while working/rendering (with max vfb)
The render in Max vfb is correct, except if you zoom in, or duplicate. i've worked dozen of hours to try to make things even more easier, but that was the limit. i'll try to work more on that point, but i've to find a trick i don't know for instance ;)

I know this is a pain, but can't do anything against that.. that is the way it works with max vfb

Using Vray VFB completely solves the problem.

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15 years 9 months ago #1054 by thomas_f
Ok, thanks - appreciate it. I'll give the Vray frame buffer a try instead...

T

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15 years 9 months ago #1058 by thomas_f
I tried the VRay frame buffer. It works fine as long as you stay in Max. But as soon as you try to open the image in Photoshop the gamma has gone crazy again. Which means it's very difficult to output an image for further editing Photoshop based on what you see in the VFB.

T

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15 years 9 months ago #1063 by zeronove
maybe you have forgotten to burn gamma into the rendered image during saving (gamma bitmap output)

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15 years 9 months ago #1067 by subburb
hmmm normally gamma is the same in photoshop than in max...
except if you've changes your max save options.. ?
if you use the "use system default gamma" as save options, you'll get (almost) the same gamma in photoshop... no ?

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