Chaos Corona Forum

General Category => General CG Discussion => Topic started by: Jpjapers on 2018-05-16, 14:59:40

Title: The age old gamma problem
Post by: Jpjapers on 2018-05-16, 14:59:40
What do i do with a scene ive been handed that hasnt got gamma enabled but uses colour selector colours?
As soon as i enable it the bitmap materials are fine but every colour in the scene washes out completely and im not sure what to do or how to fix it.
Ive tried unchecking affect colour selector and affect material editor but they seem to affect nothing i can see.

Thanks
Title: Re: The age old gamma problem
Post by: romullus on 2018-05-16, 15:37:50
Try to follow this article and you should be able to solve the gamma issues: https://coronarenderer.freshdesk.com/support/solutions/articles/5000515647-how-to-configure-gamma-
Title: Re: The age old gamma problem
Post by: Juraj on 2018-05-23, 10:34:47
Are you sure there is solution to his problem there Romulus ? I can't see anything of that sort.

Vray used to have "Linearize" option in render settings so that you could render linearly old shit scenes setup pre-gamma without messing stuff up and converting everything.
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-05-23, 14:16:26
This ended up fixing itself somehow but its only a problem ive been having recently.
Title: Re: The age old gamma problem
Post by: maru on 2018-05-24, 11:49:08
I am not sure, but MAYBE going to 3ds Max gamma settings and setting gamma to 2,2 and disabling the "affect color selectors" and "affect material editor" checkboxes would help?
Another idea would be messing with input and output gamma that you can find at the bottom of this guide (maybe this is what Romullus meant):
https://coronarenderer.freshdesk.com/support/solutions/articles/5000515647

Gamma controls in 3ds Max are a nightmare, and I hope to see them go some day...
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-05-24, 16:23:31
(https://i.imgflip.com/2ax3y3.jpg) (https://imgflip.com/i/2ax3y3)

As for changing it in the ini file it was already set to the correct amounts. Its like you can have one way or another. Either the corona bitmaps are too dark (but weirdly the max ones are fine) or the colour selectors are washed out.
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-05-31, 10:53:14
Still having weird issues with colours. My gamma is 2.2 If i use a diffuse colour its completely washed out on the material but not in the swatch. If i use a corona colour node and uncheck the linear checkbox it works fine but the standard colour picker seems incorrect?

Title: Re: The age old gamma problem
Post by: maru on 2018-05-31, 13:47:12
Still having weird issues with colours. My gamma is 2.2 If i use a diffuse colour its completely washed out on the material but not in the swatch. If i use a corona colour node and uncheck the linear checkbox it works fine but the standard colour picker seems incorrect?

Can you post your CurrentDefaults.ini file here?
From C:\Users\_username_\AppData\Local\Autodesk\3dsMax\2018 - 64bit\ENU\en-US\defaults\MAX
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-05-31, 15:59:33

<SNIP>

Can you post your CurrentDefaults.ini file here?
From C:\Users\_username_\AppData\Local\Autodesk\3dsMax\2018 - 64bit\ENU\en-US\defaults\MAX

Sure :)
Title: Re: The age old gamma problem
Post by: maru on 2018-05-31, 17:04:07
Ok, try this:
1) Close 3ds Max
2) Open that file again in its original location
3) Change:
from:

CorrectColorPickerState=0

to

CorrectColorPickerState=1

4) Save
5) Close notepad
6) Run 3ds Max
7) See if it helped
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-05-31, 17:22:50
Ok, try this:
1) Close 3ds Max
2) Open that file again in its original location
3) Change:
from:

CorrectColorPickerState=0

to

CorrectColorPickerState=1

4) Save
5) Close notepad
6) Run 3ds Max
7) See if it helped

Did that and reopened the scene i was working on and any material that was using a bitmap as a diffuse is now completely transparent. Ive had this happen quite alot in the past and pretty much always erratically.
Never figured out a way to fix it and only happens in default shaded view. However when i recheck the linear button in the corona colour node it works as it should now which is good
Title: Re: The age old gamma problem
Post by: Jpjapers on 2018-06-01, 11:54:46
I thin everything is fine now after a restart. Must have been a gpu issue (noticing a few with gtx 1080s in max and cad)