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Thread: Gamma Correction and VRay

  1. #11
    Veteran Member nicnic's Avatar
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    Default Re: Gamma Correction and VRay

    oh how do you get around it?

  2. #12
    Veteran Member Tommy L's Avatar
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    Default Re: Gamma Correction and VRay

    The materials in the materials look like they should. Think about it, how would it look if you were looking straight at a lightbox? Hmmm, pretty blown out maybe?
    There is an option in the max gamma settings that asks whether you would like the swatches in the mat editor to be affected by the gamma settings. I work in 2.2, affecting mat ed. I think the most consistent results Ive had come from Exponential exposure (1-1-2.2) but after you get the hang of things you can use the exposure settings to get creative.
    I would advise you choose a LWF exposure setting that someone recommends, leave it at that and do a project start to finish. Leave that as a constant in your workflow to begin with, you'll better understand the defaults in other areas. Exposure is the single biggest (non-render-time-affecting) setting imho. Make sure you have 2.2 as the exposure in Max, otherwise you are out of sorts..
    Do not, I repeat do NOT try and take a completed project and reverse engineer it to be LWF. It will bu MUCH easier to start from fresh. Bring in a mesh, sure, but strip it and start from scratch with render settings, materials and lights.
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  3. #13
    Veteran Member erickdt's Avatar
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    Default Re: Gamma Correction and VRay

    Thanks all for your advice. As Tommy suggests, I'll start a project from scratch and see what it's like from start to finish.

  4. #14
    Moderator Maxer's Avatar
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    Default Re: Gamma Correction and VRay

    A few months ago Jeff posted this sRGB to Linear color converter, it "de-gamma's" the colors that you take from Photoshop and converts them to linear color so Max can display it properly. Unfortuantley it's only set up to work with solid colors but it might be able to assist in your problem.
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    Veteran Member jinsley's Avatar
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    Default Re: Gamma Correction and VRay

    Quote Originally Posted by nicnic View Post
    ...

    check out the sunny 16 rule as a starting point.

    ...
    thx for this... learned something new today! Something I can use in the office and out taking photos.

    Cheers
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  6. #16
    Veteran Member WAcky's Avatar
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    Default Re: Gamma Correction and VRay

    The LWF checkbox in vray is to be used in scenes that weren't originally set up for LWF. I wouldn't recommend using this.

    My setup is as follows:

    MAX settings:
    Enable Gamma/LUT correction = checked.
    Gamma set to 2.2
    Both materials and colours check boxes checked.
    Input gamma = 2.2
    output gamma = 2.2

    Vray Settings:
    Colourmapping mode = Linear Multiply
    Gamma = 2.2
    Don't affect colours = Checked.

    Check the sRGB button in the VFB.

    This works for me. Whether its correct or not I have no idea but this is a setup that Vlado suggested.

  7. #17
    Veteran Member erickdt's Avatar
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    Default Re: Gamma Correction and VRay

    Thanks James,

    After doing several tests I've decided that the setup you describe will be my standard setup. As it turns out having both the input and output gamma set to 2.2 was the key to making it so material editor colors weren't blown out so thanks for that :-)

    One thing about your settings though: having sRGB space ticked in the VFB only makes the gamma correction affect the image in the VFB. When you save the image and open it in PS you'll notice the image is no longer gamma corrected. I've fixed this by unchecking "don't affect colors" in color mapping and unchecking sRGB space in the VFB.

    My plan is to try these settings with a series of renderings of an existing project that need to be re-rendered today for their "final renderings". I've been having exposure issues with this file that I had been correcting in PS. We'll see what affect this new setup has. I'll keep you posted.

    E

  8. #18
    Veteran Member Tommy L's Avatar
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    Default Re: Gamma Correction and VRay

    Erick,
    Make sure to post progress. I'd really like to see the work come along and the settings you use.
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  9. #19
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    Default Re: Gamma Correction and VRay

    I agree, this has been a hugely informative thread and I'd also like to see your results. Thanks for taking the time to explore this everyone!

  10. #20
    Veteran Member Sawyer's Avatar
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    Default Re: Gamma Correction and VRay

    I created a tutorial on this stuff a while back. I updated it recently let me know if this is helpful.
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