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mak4max
08-04-2012, 01:49 PM
Hello G's
Im using
3ds max 2011 64 bit
vray 1.5 sp5
photoshop CS5 Extended

Can any anybody help me to save my render output to open exr for Photoshop, BTW my render contains some "render elements " like 'vray reflection', 'vray reflection filter' etc..
Basically i wiil have a multi layered file with my " beauty pass" + " render elements". I've already installed the plugin"proEXR" for photoshop

i itried with some settings in 3d max but the brightness of the beuty pass differ in max and photoshp is there anything about gamma/LUT?

plz help me

PiXeL_MoNKeY
08-05-2012, 12:30 AM
The problem is Photoshop not 3ds max. Photoshop always applies a Color Profile to 32bit files (EXR 16bit or 32bit files come in as 32bit). Most of said color profiles define a 2.2 gamma, so be sure that you set output gamma to 1.0. However, without knowing what color profile you are using it is hard to say the proper gamma setting.

-Eric

CHRiTTeR
08-05-2012, 12:48 AM
Can you post a screengrab of the difference?

mak4max
08-05-2012, 05:11 AM
The problem is Photoshop not 3ds max. Photoshop always applies a Color Profile to 32bit files (EXR 16bit or 32bit files come in as 32bit). Most of said color profiles define a 2.2 gamma, so be sure that you set output gamma to 1.0. However, without knowing what color profile you are using it is hard to say the proper gamma setting.

-Eric

lets go deeper,

my settings as below


http://img18.imageshack.us/img18/8269/gammalut.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04


http://img256.imageshack.us/img256/7619/colormap.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04


http://img820.imageshack.us/img820/5061/outconfig.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04


http://img716.imageshack.us/img716/8320/profilecug.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04


i'd override the gamma 1.0 at output window and i used the color profile as shown, By the way i assigned most available profiles, but the result varies but not getting what i need :sad: . I think you got it crystal, And my outputs are like follows

original form max :

http://img651.imageshack.us/img651/6527/61334284.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04

Open exr out put

http://img818.imageshack.us/img818/4803/83939133.jpg
By mak4max (http://profile.imageshack.us/user/mak4max) at 2012-08-04

PiXeL_MoNKeY
08-05-2012, 05:23 AM
Change your display gamma to 2.2 and input gamma to 2.2. With output gamma at 1.0. This will generate proper linear workflow images. As long as your display gamma is set to 2.2 you will get the same result in photoshop.

Or lower the exposure in photoshop of the layers by 0.454545 (1/2.2).

You shouldn't be adjusting your gamma in the Vray color mapping unless you do it "right". You should enable Don't Effect Colors, Intensity exponential, and set the gamma to 2.2. This will adjust gamma for the sampler only, and can help with render times.

What I have outlined should ensure proper physically accurate linear workflow.

-Eric

mak4max
08-07-2012, 02:03 AM
Change your display gamma to 2.2 and input gamma to 2.2. With output gamma at 1.0. This will generate proper linear workflow images. As long as your display gamma is set to 2.2 you will get the same result in photoshop.

Or lower the exposure in photoshop of the layers by 0.454545 (1/2.2).

You shouldn't be adjusting your gamma in the Vray color mapping unless you do it "right". You should enable Don't Effect Colors, Intensity exponential, and set the gamma to 2.2. This will adjust gamma for the sampler only, and can help with render times.

What I have outlined should ensure proper physically accurate linear workflow.

-Eric



Thanks a ton eric , with lots of usefull infos, i will play around,
thank you again

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