Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: arqrenderz on 2021-09-15, 16:47:55

Title: How to save Exr and retain dynamic range In Post ?
Post by: arqrenderz on 2021-09-15, 16:47:55

Hi im looking for a way to save the exr in 32 bits and retain the exposure values just like the frame buffer, so far i just get a very dull image if i want to change the exposure using PS in 32 bits, its like changing an LDR image. I Know Corona CXR but the file sizes are so big...
Also tried inside davinci resolve and its the same..
Im saving the image as *.exr Full Loat 32 Bits  RGBA, have also tried integrer 32 bits and that comes corrupted..

Title: Re: How to save Exr and retain dynamic range In Post ?
Post by: TomG on 2021-09-15, 17:01:16

Bear in mind that Photoshop is terrible at handling EXRs. Be sure to use the free EXR-IO plugin to load them into PS.

Title: Re: How to save Exr and retain dynamic range In Post ?
Post by: arqrenderz on 2021-09-15, 17:13:41

Yes, im using it to load exr with layers. Also using Davinci resolve but the result is the same...
Im attaching a picture to show what im looking for, I saved an underexposed image and then use exposure to correct it inside Davinci resolve, the result is a whased out image, and on the right its corona VFB with the changed exposure.
Its an exr 32 bit Full Float

Title: Re: How to save Exr and retain dynamic range In Post ?
Post by: dj_buckley on 2021-09-15, 17:34:38

Could this be to do with the fact your saving the Exr with HC set to 8 and Contrast set to 3?  i.e. burning those settings in on save and thus losing some of the original dynamic range, or does that not apply to EXR's?