# Render elements don't add up to RGB result when using burn value for Reinhard mapping **URL:** \ **Category:** Issues\ **Created:** [May 21, 2014, 2:48pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897 "2014-05-21T14:48:36Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![kosso\_olli](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kosso\_olli](https://forums.chaos.com/u/kosso_olli)\ **Post date:** [May 21, 2014, 2:48pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/1 "2014-05-21T14:48:36Z")
I have a small problem here. I rendered a rim for a car where I used the burn value in the Reinhard color mapping settings to reduce the burnt out areas. The problem now is that I can’t get my renderelements to add up to the rgb result. The layered version is a little brighter. I fiddled around with the color mapping checkbox in the render element section, but that didn’t help. The renders were saved as .exr. Am I missing something? Regards Oliver ![rgb_result.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/7/1/71d42ae9bb0db3618d5ead85cd46bb8ae952fb1b.jpeg) ![layer_result.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/4/d/4dcf754fa7f8f8c6fcc7dd71e820d325b34a9271.jpeg) ![settings.JPG](https://europe1.discourse-cdn.com/chaosprd/original/3X/a/a/aa1492573f030d6e112ba3d74e24b9354d7e56e6.jpeg) ---
**Author:** ![Pixelcon](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/pixelcon/32/22319_2.png) [@Pixelcon](https://forums.chaos.com/u/Pixelcon)\ **Post date:** [May 21, 2014, 3:16pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/2 "2014-05-21T15:16:14Z")
I think this is just how it works. Compositing has to be in a linear format and by changing the burn value from 1, you’re changing the image to a non-linear format. If you render with 32-bit you can emulate the burn value decrease with a curves adjustment in your compositing app. ---
**Author:** ![kosso\_olli](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kosso\_olli](https://forums.chaos.com/u/kosso_olli)\ **Post date:** [May 21, 2014, 3:20pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/3 "2014-05-21T15:20:25Z")
Okay. I am not sure but I could swear that it worked back in 2.4. Also, the image is rendering in nearly half the time when using the burn value. Seems the sampler has an easier job that way. ---
**Author:** ![kosso\_olli](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kosso\_olli](https://forums.chaos.com/u/kosso_olli)\ **Post date:** [May 22, 2014, 9:09am UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/4 "2014-05-22T09:09:06Z")
Now, is this behavior expected or am I doing something wrong? EDIT: Tested it with color mapping set to HSV Exponential, with dark and bright multipliers set to 1. The problem is the same, I can’t get the correct result with layering the renderelements. ---
**Author:** ![svetlozar.draganov](https://dub1.discourse-cdn.com/chaosprd/user_avatar/forums.chaos.com/svetlozar.draganov/32/53004_2.png) [@svetlozar.draganov](https://forums.chaos.com/u/svetlozar.draganov)\ **Post date:** [May 22, 2014, 10:42am UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/5 "2014-05-22T10:42:37Z")
Have you tested it with color mapping set to Linear / dark multiplier 1 / white multiplier 1 / gamma 2.2 ? If that doesn’t work then there is something wrong. Are all materials in the scene Vray materials? What application you are using from compositing? In what bit depth are the outputted files? ---
**Author:** ![vlado](https://avatars.discourse-cdn.com/v4/letter/v/779978/32.png) [@vlado](https://forums.chaos.com/u/vlado)\ **Post date:** [May 22, 2014, 12:20pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/6 "2014-05-22T12:20:34Z")
> [@Memory Lane](https://forums.chaos.com/t/memory-lane/44869/8): > > Okay. I am not sure but I could swear that it worked back in 2.4. No, it didn’t work either. (How can you swear about it if you are not sure :)) > Also, the image is rendering in nearly half the time when using the burn value.Then set the color mapping mode to “None”. You will keep the render times, but you’ll get a linear image out in the end. Best regards, Vlado ---
**Author:** ![kosso\_olli](https://avatars.discourse-cdn.com/v4/letter/k/dfb087/32.png) [@kosso\_olli](https://forums.chaos.com/u/kosso_olli)\ **Post date:** [May 22, 2014, 1:46pm UTC](https://forums.chaos.com/t/render-elements-dont-add-up-to-rgb-result-when-using-burn-value-for-reinhard-mapping/49897/7 "2014-05-22T13:46:52Z")
> [@Texture website - help me find it!](https://forums.chaos.com/t/texture-website-help-me-find-it/44912/2): > > No, it didn’t work either. (How can you swear about it if you are not sure :)) > > Then set the color mapping mode to “None”. You will keep the render times, but you’ll get a linear image out in the end. > > Best regards, > Vlado That’s true, checked it with 2.4 this morning, it didn’t work. Don’t know what I was thinking of… Will revert to linear color mapping and default multipliers and find a way to reduce the burnt out areas. Regards Oliver