Chaos Corona Forum
Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: Stof on 2022-12-19, 14:43:25
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So using the light selects inside corona its possible to adjust the lighting color etc. with the lightmix feature.
I want to be able to do this but inside the photoshop by adjusting the individual light selects.
Do anyone have an idea on how to do this?
I have been trying to adjust the lightselects inside photoshop but with no luck.
Is this even possible?
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It is possible. You'll have to save to EXR format (or CXR, and rename to EXR) as you need the high dynamic range. JPGs and PNGs are no good here :)
Then stack them in Linear Add mode. Then use Adjustment Layers (use the option to only affect the layer it is attached to) such as Exposure and Hue to make the same adjustments as intensity and color do in the VFB/CIE.
Also, you could just use the CIE (Corona Image Editor), depending on what you want to do? This lets you do all the LightMix stuff in post without having Max or C4D open.
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PS you won't need the Beauty pass, as assembling the LightMix layers will give the Beauty (until you turn some on or off, adjust their intensity, or their color, etc :) )
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wow Tom thanks alot, i will try this and check if i can get it to work! :D
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Let us know if you have any problems and we'll be happy to try to help. Also, you can do the same thing in a video editor, and animate the Exposure and Color changes, the on-offs, fade in opacity to have lights come on or off gently, and thus make an animation out of only one frame of rendering (though only the lighting will be animating of course ;) )
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okay so i tried it now and the exposure is working perfectly, but the hue still seems to not function properly
i attached the lightmix so you can see how the light looks inside the lightmix in corona vfb.
The picture cap1 shows the hue at red but does not affect the light like in corona - although the exposure works perfectly.
I have set the background layer for linear dodge (add)
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Heres where the saturation is at 100
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Did you enable Colorize for the Hue/Sat adjustment?
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Damn Tom your amazing, that worked - thank you so much!
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TY for the kind words, and you are welcome!
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Hi Tom,
I have another question, can you adjust the light selects and then change the base color of the object separately so that the hue don't affect the base color of the object?
hope you understand my question...
See attached files
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The picture with the red chairs is the base color.
It is because I want to be able to change the color of the chair in post as well, separate from the lights.
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You'd need to create a mask render element, then use that to create a mask in Photoshop which will let you "cut out" an object. That can then let you either apply things like adjustment layers to the object(s) you masked, or let you do things like not have the light from a LightSelect fall on the object, or anything else really that you can use a mask for :)
https://support.chaos.com/hc/en-us/articles/4528356418449-How-to-use-smart-masks-in-Corona-for-3ds-Max- should help.
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PS and if you don't want to re-render, you can just use "Render only masks" as masks are not dependent on doing all the actual rendering to generate.
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Yes alright, i am rendering the individual objects eaither way and then layering them above the forground so i guess that should work :P
Thanks again :)
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https://forum.corona-renderer.com/index.php?topic=33266.msg186159#msg186159
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sorry to bump this,but how did I composite those light select together in photoshop and match the tonemapped result in vfb? Im only able to get a linear result in photoshop.
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If you're going to composite things in post, you must skip tone mapping in the VFB and do that in post instead (as almost all tone mapping will stop the output being linear, and then compositing will not work properly). If you've developed some tone mapping you like in the VFB, you'd have to disable it and recreate it using equivalents in your post editor of choice (pretty straightforward stuff, there's generally a one-to-one in terms of any given tone mapping function).
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Also, on thinking about it, if you prefer to use the VFB for tone mapping due to familiarity - you should be able to save the composited but not tone mapped result from your post editor to EXR, rename to CXR, and load into the VFB to use the familiar VFB tools, if you like :) Hope this helps! Tom
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If you're going to composite things in post, you must skip tone mapping in the VFB and do that in post instead (as almost all tone mapping will stop the output being linear, and then compositing will not work properly). If you've developed some tone mapping you like in the VFB, you'd have to disable it and recreate it using equivalents in your post editor of choice (pretty straightforward stuff, there's generally a one-to-one in terms of any given tone mapping function).
Yeah,CXR save works with VFB lightmix,problem is I have to share my output file with my colleague and let him do the lightmix adjustment,while he doesnt have access to VFB, for curve or lut there is 1 to 1 match in photoshop,but for filmic mapping/tone curve part I cant find a 1 to 1 match function, we can get a similar result but not the same as VFB. but nevermind, just use CXR with VFB now.