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textures and gamma
show user profile  zeefusion
I have been running some tests comparing the rendered result of a texture compared to the original JPEG texture file. The rendered result is much brighter when using gamma 2.2. Almost so much that it doesn't look like the same texture. Ie a certain wood texture that has a distinct tone to it.

Using Vray with linear colour mapping and don't effect final image. So rendering in linear space with sRGB preview on. The lighting is not over bright, camera exposure is normal too.

Is this to do with using gamma 2.2 textures and then making them linear and then viewing them with gamma 2.2 again? Is it not quite adding up as should?
read 260 times
1/4/2012 6:20:38 PM (last edit: 1/4/2012 6:20:38 PM)
show user profile  3joez
What light rig are you using?
What are the camera values?

I use exactly the same process, and I think the difference might reside in the actual light conditions
the texture is being calculated on. Count the geometry, the reflection, bumps, direct and indirect ligth, etc...


read 237 times
1/5/2012 10:11:46 AM (last edit: 1/5/2012 10:11:46 AM)
show user profile  zeefusion
Just using Vray plane lights nothing too complex. Camera has ISO 200 f-stop 5.6 and shutter speed 60. The scene looks correctly illuminated to me how ever the textures are much brighter than the actual JPEG image. I know lights can make them brighter but it seems to be too bright.
read 234 times
1/5/2012 10:14:59 AM (last edit: 1/5/2012 10:14:59 AM)
show user profile  digital3ds
I don't use vray and I noticed "texture's", assuming it's not a material color. I'm not sure if this will help, but (for example) if you db click your material color and hit ctrl n you'll bring up the numerical calc.... if you -cube root- the color value for ( red, green, blue ) of the texture you'll get a result much more accurate (in mr) during the render for your color. (maybe apply these numerical values into Photoshop image adjustments)?
- Mike Sawicki




read 226 times
1/5/2012 10:41:25 AM (last edit: 1/5/2012 10:41:25 AM)
show user profile  3joez
Hey James, I did a quick test for you.
I've picked up a scene that I use to test materials and I must say, they are quite similar.
And I didn't touch anything, except for the texture which I've simply loaded, overriding with 2,2
(in the max preferences I have input image gamma set to 1, in case I'm dealing with hdris or normal maps)
Take a look.

read 220 times
1/5/2012 11:52:02 AM (last edit: 1/5/2012 11:52:02 AM)
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