White Balance Vantage Vs Photoshop

[pablo_vincius]

Hello, everyone.
Doing some testing, I realized that vantage white balance doesn't work like most photography software, it seems to me that it throws an orange filter on the images, and it gives a "weird" look, is there any way to calibrate that?

[npg]

I may be wrong, but it seems to me that the photoshop image is brightened up. Are you sure WB is the only correction applied? The Vantage WB is pretty simple and now that I think of it, it's not energy preserving because it works as a color filter, reducing the final luminance. (EDIT: Actually the filter gets normalized, so that's not it) Does the image get closer to the photoshopped one if you bump the exposure in Vantage a bit (you should be able to do a side-by-side of the two windows with Vantage in interactive mode)?

Also, how do you compare values, do you enter the same RGB numbers? Is the Vantage color picker dialog in linear or in sRGB mode when you take the RGB values?

[pablo_vincius]

I may be wrong, but it seems to me that the photoshop image is brightened up. Are you sure WB is the only correction applied? The Vantage WB is pretty simple and now that I think of it, it's not energy preserving because it works as a color filter, reducing the final luminance. (EDIT: Actually the filter gets normalized, so that's not it) Does the image get closer to the photoshopped one if you bump the exposure in Vantage a bit (you should be able to do a side-by-side of the two windows with Vantage in interactive mode)?

Also, how do you compare values, do you enter the same RGB numbers? Is the Vantage color picker dialog in linear or in sRGB mode when you take the RGB values?

Hello, thanks for the return.

The images have equal exposures, but the WB of vantage is "killing" the highlights, I made an example video attached.

The WB of vantage gets closer with the Photoshop color filter, oq leaves a very strange look. (Note that the Photoshop color filter doesn't leave the highlights opaque)

I tested changing the srgb color patterns and nothing changes.

[pablo_vincius]

Vantage WB closely resembles the ephemeous "Color Filter" by playing an orange color

[npg]

I looked into it, but I could not see something wrong. We use the same formula as the white balance correction in the V-Ray VFB. The slider you use is based on a black body radiation formula and you can see that the color spectrum indeed looks like this: https://en.wikipedia.org/wiki/Black-...800-12200K.svg

I don't know why Photoshop's slider has such a different tint. I found this in the Adobe help ( https://helpx.adobe.com/camera-raw/u...ts-camera.html ):

The range and units for the Temperature and Tint controls are different when you are adjusting a TIFF or JPEG image. For example, Camera Raw provides a true-temperature adjustment slider for raw files from 2,000 Kelvin to 50,000 Kelvin. For JPEG or TIFF files, Camera Raw attempts to approximate a different color temperature or white balance. Because the original value was already used to alter the pixel data in the file, Camera Raw does not provide the true Kelvin temperature scale. In these instances, an approximate scale of -100 to 100 is used in place of the temperature scale.

It seems we are comparing apples to oranges.

p.s. Note that the slider allows you to go down to 1000K which is probably a bit too low as objects don't glow at such temperatures practical light sources have higher temperature and the blue component is trending toward zero leading to extreme results. The VFB starts at 3000K which is too high in my opinion as there are 2700K bulbs for example, but values below 2000K probably don't make much sense.

[pablo_vincius]

I looked into it, but I could not see something wrong. We use the same formula as the white balance correction in the V-Ray VFB. The slider you use is based on a black body radiation formula and you can see that the color spectrum indeed looks like this: https://en.wikipedia.org/wiki/Black-...800-12200K.svg

I don't know why Photoshop's slider has such a different tint. I found this in the Adobe help ( https://helpx.adobe.com/camera-raw/u...ts-camera.html ):

The range and units for the Temperature and Tint controls are different when you are adjusting a TIFF or JPEG image. For example, Camera Raw provides a true-temperature adjustment slider for raw files from 2,000 Kelvin to 50,000 Kelvin. For JPEG or TIFF files, Camera Raw attempts to approximate a different color temperature or white balance. Because the original value was already used to alter the pixel data in the file, Camera Raw does not provide the true Kelvin temperature scale. In these instances, an approximate scale of -100 to 100 is used in place of the temperature scale.

It seems we are comparing apples to oranges.

p.s. Note that the slider allows you to go down to 1000K which is probably a bit too low as objects don't glow at such temperatures practical light sources have higher temperature and the blue component is trending toward zero leading to extreme results. The VFB starts at 3000K which is too high in my opinion as there are 2700K bulbs for example, but values below 2000K probably don't make much sense.

I get it, this scene I converted from corona renderer, it seems to me that there is a slight difference of tones in the WB.

I tested it on Vray VFB and really the WB is the same as vantage.

I appreciate the patience.