render view with logarithmic compression

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Hi,

I will cross post this topic also here to this forum maybe someone can help me.

https://forums.odforce.net/topic/43598-render-view-with-logarithmic-compression-tone-mapped/?tab=comments#comment-206163 [forums.odforce.net]


I try to find a way to display my renders with a logarithmic compression in the render view. Since mantra has no function to apply a color mapping directly to the image my idea was to do that with a LUT but it seems really hard to find a lut that is creating a “simple” logarithmic compression.

I tried to create a lut myself in cops with soft clip node which gives the desired results but unfortunately I can´t create luts from that vopcop filter. Only from color correction operators.

I would be grateful for some help.

cheers
Jon
Edited by jon3de - Nov. 15, 2019 06:25:07

Attachments:
logarithmicCompress.JPG (126.5 KB)

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You can't create a lut from vop cop, but you can from a chop. What I've done before is create the lookup using vopchop, and then reference the chop using a lookup cop. Then you can save that as a lut.

You might want to look into the aces profile in the OCIO plugin. That has a built in tone curve.
Edited by jsmack - Nov. 15, 2019 17:36:41
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hey jsmack,

Thank you very much for your reply. I had a look at the aces profile and installed it. Thats nice!!

The tip with chops is also very intersting. Is it enough to just create a vopchop in chops with the soft clip? Or do I need something else there? Right now it does not really use the copvop in the lookup cop. It gives me just black values.

cheers
Jonathan

Attachments:
chop_network.JPG (17.5 KB)
vopchop.JPG (28.0 KB)
test.hipnc (327.2 KB)
cop_network.JPG (18.6 KB)

https://vimeo.com/jon3de [vimeo.com]
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