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Can someone please explain Gamma to me?
show user profile  jpedleham
Im having problems at work with Gamma. Is it just a case of switching it on in an existing scene and things will be fine? Most of the time when i enable gamma, the bitmaps in the scene go washed out or sometimes change colour. Can i do anything about this? Its very confusing. Id like to start using gamma all the time but most of the models we bring in from our model library look washed out. So can someone explain what i should be doing if i want to go from a non gamma to a gamma enabled workflow? Its really doing my head in!


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8/7/2015 10:21:53 AM (last edit: 8/7/2015 10:21:53 AM)
show user profile  LionDebt
You'll want to learn about a linear workflow.

Google will be your friend.

There have been a bunch of posts on gamma correction, linear workflow.

If you google search with "site:" in your search terms - you'll get those threads (the search tool here is a bit temperamental).
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8/7/2015 11:50:41 AM (last edit: 8/7/2015 11:50:41 AM)
show user profile  FX
The linear workflow is an opportunity for individuals who don't know what they are talking about to try and sound like they do, and confuse the hell out of you in the meantime.

It's a conspiracy, all fixable in post with an exposure layer. :)

read 663 times
8/7/2015 12:00:18 PM (last edit: 8/7/2015 12:00:18 PM)
show user profile  BishBashRoss
Yup. that's good advice (Liondebt). It's a fairly complicated subject and there are good resources around that explain it well.

Just a couple of things that I think might be helpful though.

firstly, when you first switch to 2.2 the material editor will look washed out, after a while you will get used to this. Now whenever I see the non corrected editor it looks way to contrasty and dark.

Secondly, you'll need to make sure your diffuse bitmaps are corrected also or they will be very washed out.

Aversis had a very good tutorial take a look at that.


Just to add one more thing. The whole process will probably make more sense if you start a scene from scratch with the new gamma settings than try to convert an old scene.

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8/7/2015 12:07:41 PM (last edit: 8/7/2015 12:11:49 PM)
show user profile  FX
Ok, I jest, but yes, there is a ton of info out there on the linear workflow, some go more "in depth" than others, when you have everything set up save as maxstart so you don't have to do it all again.

read 648 times
8/7/2015 12:26:00 PM (last edit: 8/7/2015 12:26:00 PM)
show user profile  BishBashRoss
Yeah I agree. It's actually quite complicated to understand completely. But as far as using it, it's just a few ticked checkboxes and getting used to checking your bitmaps. Easy peasy. :)

read 643 times
8/7/2015 12:29:15 PM (last edit: 8/7/2015 12:29:15 PM)
show user profile  FX
Yeah, I don't feel the need to understand it completely , I just need it to work ;)

Isn't all this scriptable?...a linear workflow wizard ?

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8/7/2015 12:41:17 PM (last edit: 8/7/2015 12:41:17 PM)
show user profile  jpedleham
All of the scenes i work with use shared bitmaps so hopefully if i can correct them all, the scenes should be fine. is there a way to batch them?? how do you know if they need to be gamma corrected?


read 631 times
8/7/2015 12:51:16 PM (last edit: 8/7/2015 12:51:16 PM)
show user profile  BishBashRoss
You don't need to change the bitmaps. Just tell Max how to interpret them. If you use the settings in the tutorial I posted you should only have to override the gamma on your non diffuse maps (very important for Normal maps). You do this by selecting Override in the select bitmap dialogue and setting it to 1.0.

But you really need to run through a tutorial to get to grips with this. It's hard to explain without images to go along with it.

read 618 times
8/7/2015 1:34:40 PM (last edit: 8/7/2015 1:34:40 PM)
show user profile  Garp
You do NOT want to gamma-correct bitmaps used for computation (bump, displacement, opacity, blending, etc).

read 601 times
8/7/2015 3:48:25 PM (last edit: 8/7/2015 3:48:25 PM)
show user profile  9krausec
Well.. When two people really love each other, they make something called "love" which is where babies come from. It's a magical bond between two people and is impor.... (shit, wrong explanation. sorry)-

- Portfolio-

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8/7/2015 7:37:40 PM (last edit: 8/7/2015 7:37:40 PM)
show user profile  FX
I think I actually learned something from that, what I didn't realise, and explains a few issues I've had with washed out textures in the past, is that max by default uses the embedded gamma value of diffuse textures.
And like the author of that video I've always tried to counter it with excessive light / exposure rather than at source.

...maybe should have phrased that as a question ;)

read 550 times
8/8/2015 3:05:20 AM (last edit: 8/8/2015 3:05:20 AM)
show user profile  donvella
Oh Shrodingers Gamma. Funny enough after all these years I have gone back to turning off the LUT and using the linear workflow button in vray (the horror!) lol. Couple of reasons why

1. It works for old scenes
2. You never need to worry about gamma, its only applied once if you set the output 'srgb' display to 2.2 and save as exr. (you get the display gamma and the non burnt in gamma for output)
3. You can bring in any scene and all your bitmaps will be linear from start to end. 1.0 to 1.0 then u apply a 2.2 if you want later (or it will display as 2.2 in photoshop)
4. You get your complete value range. (turn on your LUT, look at your color picker and type in 64 in the value range, now turn it off and do the same, you lose alot of blacks with the former), its crunched,.
5. You never need a vray color, your color pickers will always be in correct gamma, therefore if you type in a dulux color value it will appear exactly as it does on the swatch.
6. I get to fuck with everyone on forums because they think i must be a 65year old crack pot who still uses the linear workflow button

This is a good script to convert bitmaps if your having washed out issues

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8/10/2015 1:58:18 PM (last edit: 8/11/2015 12:53:59 AM)
show user profile  FX
"This is a good script to convert bitmaps if your having washed out issues"

Awksum, added to the collection, perfect timing... thx
read 488 times
8/11/2015 2:48:45 AM (last edit: 8/11/2015 2:48:45 AM)
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