Post-production color change

[glorybound]

I have some kitchen cabinets that I need to change colors. My plan was in post, but it isn't going well. I made the cabinets mid-gray and I put a layer over the mid-gray in PS, trying different colors and blend modes. Now, I am trying a VRay Diffused Filter to get some detail back. Any suggestions on how to change color in PS?

[fixeighted]

Can't you just render selected them? Probably quicker than messing around in PS tbh
Otherwise, if you're busy, share a crop of them and say what you need and I'll take a look. Nothing on here and I'm bored

[glorybound]

I tried, but it isn't usable.

[Neilg]

you need to do this in a 32bit file. take your raw diffuse, have a folder above it set to 'multiply', inside the folder have the raw light added to the raw gi, then add the reflection, specular, refraction etc above that folder.
you then change the color of the raw diffuse without affecting any of the light/GI, specular or reflection above it.

[glorybound]

Sounds complicated . I have been having people want interactive sites and they are requesting 100's of variations of renderings. They send me these lists and they have no clue what they are asking. A dozen color options, countertop options, door styles, hardware types, and they don't take into account how this multiplies. Simple math says that you are talking hundreds of renderings. How many combinations? I am trying to make things easy so it doesn't kill me.

[fixeighted]

Yeah, I forgot that render selected is only a nice idea in theory Shame.

Anyway, if you prospectively have many to do, then Neil's method sounds like the only sane way to go about it really (for colour changes only though)
Otherwise, cryptomattes?

For the other stuff they are more complex so just charge them for new renders where appropriate I reckon.

[glorybound]

I switched to GPU and I am getting 8 minute render times. I might just do a new render for each one instead of spending about as long in PS messing with colors. I was using PSD Manager for things like this, but there isn't a V-Ray 5 update as of yet.

[fixeighted]

Sounds like a plan

[Neilg]

Sounds complicated .

It took me longer to type that out than it does to actually do it, it's not even remotely complicated.

[joconnell]

Neilg do you find that there's a point where the antialiasing breaks with these things? I find if grading internal detail of a render that the edges get a bit dirty with extreme things since you're grading something that doesn't have a nice premult edge against black.

Bobby, might be worth looking at this for such automation - https://youtu.be/TWYymL_hlAc

[glorybound]

you need to do this in a 32bit file. take your raw diffuse, have a folder above it set to 'multiply', inside the folder have the raw light added to the raw gi, then add the reflection, specular, refraction etc above that folder.
you then change the color of the raw diffuse without affecting any of the light/GI, specular or reflection above it.

This is what my raw passes look like (useless). It has been this way since V-Ray NEXT. I use an HDRI. This is RAW diffused.

[glorybound]

you need to do this in a 32bit file. take your raw diffuse, have a folder above it set to 'multiply', inside the folder have the raw light added to the raw gi, then add the reflection, specular, refraction etc above that folder.
you then change the color of the raw diffuse without affecting any of the light/GI, specular or reflection above it.

Can you build something out for me so I know what is suppose to work? I am not having any luck.

[Neilg]

There's no way that pass is the rawdiffuse. Is that a light select element?

You need these in its most basic form.
raw diffuse goes at the bottom of your photoshop layers. above it is a folder with raw light and raw GI. raw light is above raw GI and is set to 'add' mode. the folder itself is set to multiply. everything else is above that folder and set to add. it's 6 photoshop layers.



This part of the docs has mention of exactly what you're trying to do. It used to be in the official documentation dating back to at least vray 2 but they've stripped it all out of the max section for some reason.

https://docs.chaosgroup.com/display/...yDiffuseFilter

[glorybound]

Thank you! I'll give it another go.

[Muhammed_Hamed]

Sounds complicated . I have been having people want interactive sites and they are requesting 100's of variations of renderings. They send me these lists and they have no clue what they are asking. A dozen color options, countertop options, door styles, hardware types, and they don't take into account how this multiplies. Simple math says that you are talking hundreds of renderings. How many combinations? I am trying to make things easy so it doesn't kill me.

This could be automated with Code if you have access to Nuke.. you will only render beauty once(for the color variations at least)
If you have an EXR(with back to beauty elements) I can send you an example Nuke script