Jonathan Mack

ronald_a

olivierth
Sorry, I was a bit busy.

I wanted to create a simpler scene to upload and I noticed that I get a very similar result for both Houdini/Karma and Maya/Arnold when I set both View Transform to RAW. This shows me that the colormanagement must be the problem.

Here are my default setting when I open a new Houdini 20.0.671:
sRGB - Display
Un-tone-mapped

Is this right?

View needs to be set to ACES 1.0 - SDR Video. This should be the same in Maya/Arnold as well.

that's not true at all, only use the ACES tonemap if you want the tonemapped look. Using that tonemap will only exacerbate the issue since it totally crushes the shadow values in the image.

For the original issue, to determine if it's a colorspace issue or a renderer difference, open both renders in the same viewer--that should reveal any difference if both renders are treated the same.

Is it possible to read an exr with an oversized data window and have the image plane created read the entire data window with an appropriate layer transform? When I read an image rendered with overscan, the over-scanned data window appears to be discarded.

HDR in the viewer is only supported on Mac OS

Log spaces like PQ still don't display as HDR on Mac, however it's not required. Simply select Display P3 - Display as the display and Untonemapped as the view and you will get HDR values without tone mapping. to get The ACES 1.1 HDR 1000 nits tone map applied, edit the config by adding the ACES 1.1 view to the Display P3 display and it will tone map it with HDR head room.