Incorrect Color

[Nicolas Saba]

Hello people, the last couple of projects I had problems with the colors requested by the client and the result by corona,
the color in corona (3d max generally I think) always differ it usually brighter,

I'm using gamma 2.2 corona sRGB picker, I tried using the color as an image (created in photoshop) and apply as texture didn't work either,
So what I did was got the base RGB from photoshop and try to tweak the color in corona interactive to hit the exact color RGB, the only problem is that its a bit time consuming,

So I was wondering does anyone has an easier solution?

Thanks in advance

[Jpjapers]

Hello people, the last couple of projects I had problems with the colors requested by the client and the result by corona,
the color in corona (3d max generally I think) always differ it usually brighter,

I'm using gamma 2.2 corona sRGB picker, I tried using the color as an image (created in photoshop) and apply as texture didn't work either,
So what I did was got the base RGB from photoshop and try to tweak the color in corona interactive to hit the exact color RGB, the only problem is that its a bit time consuming,

So I was wondering does anyone has an easier solution?

Thanks in advance

Can you show a side by side comparison?

[Nicolas Saba]

Thank You for your reply
The Image below is rendering in a neutral lighting scene, with corona color material with no reflection or glossiness

[GeorgeK]

Hello people, the last couple of projects I had problems with the colors requested by the client and the result by corona,
the color in corona (3d max generally I think) always differ it usually brighter,

I'm using gamma 2.2 corona sRGB picker, I tried using the color as an image (created in photoshop) and apply as texture didn't work either,
So what I did was got the base RGB from photoshop and try to tweak the color in corona interactive to hit the exact color RGB, the only problem is that its a bit time consuming,

So I was wondering does anyone has an easier solution?

Thanks in advance

You can always use CMasking_Mask,CMasking_id or CMasking_wirecolor, that way you can have some control over your colors in post production.

[Jpjapers]

Thank You for your reply
The Image below is rendering in a neutral lighting scene, with corona color material with no reflection or glossiness

How is your lighting set up? Just as it does in the real world, The brighter a surface is lit, the more desaturated it becomes.
One other consideration is that if using kelvin to colour your lights, it is slightly broken and 6500k in a corona light is actually tinted magenta. Using direct input and setting it to 255 white yields an accurate result if using 6500k in the VFB which you should be in this instance.

[Nicolas Saba]

Thank You for your reply
The Image below is rendering in a neutral lighting scene, with corona color material with no reflection or glossiness

How is your lighting set up? Just as it does in the real world, The brighter a surface is lit, the more desaturated it becomes.
One other consideration is that if using kelvin to colour your lights, it is slightly broken and 6500k in a corona light is actually tinted magenta. Using direct input and setting it to 255 white yields an accurate result if using 6500k in the VFB which you should be in this instance.

Yes I actually use the kelvin to colour my lights, thanks for the advice will give a try using direct input.

[Nicolas Saba]

Hello people, the last couple of projects I had problems with the colors requested by the client and the result by corona,
the color in corona (3d max generally I think) always differ it usually brighter,

I'm using gamma 2.2 corona sRGB picker, I tried using the color as an image (created in photoshop) and apply as texture didn't work either,
So what I did was got the base RGB from photoshop and try to tweak the color in corona interactive to hit the exact color RGB, the only problem is that its a bit time consuming,

So I was wondering does anyone has an easier solution?

Thanks in advance

You can always use CMasking_Mask,CMasking_id or CMasking_wirecolor, that way you can have some control over your colors in post production.

I know but i wanted to get the color as close as possible from 3d max, but thanks for the advice

[maru]

Could you post a sample scene with this issue? I am sure that would help us understand it better. You can use our private uploader for this: https://corona-renderer.com/upload
Are you using some LUT, post-processing or tone mapping in the VFB? Color temperature?

[Nicolas Saba]

Could you post a sample scene with this issue? I am sure that would help us understand it better. You can use our private uploader for this: https://corona-renderer.com/upload
Are you using some LUT, post-processing or tone mapping in the VFB? Color temperature?

Ive attached 2 images, one with VFB tone mapping and the other without,
In both cases the colors are off, but i think this is a 3d max problem it won't read the colors correctly, i tried the color as a tiff image and corona color

[maru]

In this case, it looks like the wall is actually affected by some kind of light, like from sky. Isn't that the case?

[Nicolas Saba]

In this case, it looks like the wall is actually affected by some kind of light, like from sky. Isn't that the case?

I guess, im just gonna use color correct and override the lightness, thank you all for your help

[Jpjapers]

In this case, it looks like the wall is actually affected by some kind of light, like from sky. Isn't that the case?

I guess, im just gonna use color correct and override the lightness, thank you all for your help

Dubcat has a very in-depth post about how the paint swatches on paint sites already take into account the LRV of the paint finish meaning they are often already adjusted to compensate for real world lighting. He has a method of adjusting paint swatches to their actual albedo value without the LRV adjustment.

https://forum.corona-renderer.com/index.php?topic=13398.msg124782#msg124782

[Nicolas Saba]

In this case, it looks like the wall is actually affected by some kind of light, like from sky. Isn't that the case?

I guess, im just gonna use color correct and override the lightness, thank you all for your help

Dubcat has a very in-depth post about how the paint swatches on paint sites already take into account the LRV of the paint finish meaning they are often already adjusted to compensate for real world lighting. He has a method of adjusting paint swatches to their actual albedo value without the LRV adjustment.




https://forum.corona-renderer.com/index.php?topic=13398.msg124782#msg124782

Dude this was really helpful, thank you very much

[Jpjapers]

<SNIP>

Dude this was really helpful, thank you very much

No Problem!

[cjwidd]

[...] it is slightly broken and 6500k in a corona light is actually tinted magenta. Using direct input and setting it to 255 white yields an accurate result if using 6500k in the VFB [...]

Is this confirmed (intentional) behavior? I have seen the other posts about this (re: 6500k white and pink plane lights), but I could not tell whether there was some consensus regarding the feature.

For correct white balance (including light color adjustments with Light Mix), the recommended approach is, in fact, to set the light color to 255, 255, 255 - not 6500k - and leave the VFB color temperature at 6500k?