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5

Make colors more accurate. Add oklab to Photoshop (besides Gradient tool)

Community Beginner ,
May 04, 2024 May 04, 2024

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I noticed that oklab (perceptual) method of showing colors was added to the gradient tool, and suggest that it be added as an option of displaying and choosing colors more accurately.

 

Here is a well known example of blue color inaccuracy with curent methods:

Skift_0-1714843547234.png

The left is what Oklab HSB/HSV would look like while on the right is the default RGB HSB/HSV that Photoshop currently uses.

 

It would also help solving color distotions when changing opacity and blend modes, because currently the only blend mode in photoshop that doesn't distort hues is Multiply.

Skift_1-1714845428172.png

Left is opacity at 50% using RGB method

Right is opacity at 50% using Oklab method (simulated)

 

using "lighten" blend mode with a different color

Skift_3-1714847711224.png

Left is current

Right is Oklab (simulated)

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iPadOS , macOS , Web , Windows

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5 Comments
Community Beginner ,
May 04, 2024 May 04, 2024

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Noticed I messed up the last image slightly, and there's no edit button, so here's the fixed image:

Skift_0-1714848936495.png

 

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Community Expert ,
May 04, 2024 May 04, 2024

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Yeah, this is interesting. Oklab is a variation of Lab, as the name implies, but with much better perceptual uniformity. In particular, the blue to purple shift is familiar to most (but hard to find intelligible explanations for).

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Community Expert ,
May 05, 2024 May 05, 2024

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Actually I'm not very impressed with the green example - it has its own hue shift towards cyan in the darker shades.

 

But no argument regarding the "perceptual" mode in the gradient tool. It's much better. The standard Lab model certainly has a very severe blue to purple shift as saturation decreases, which is what it does as you go to white.

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Community Beginner ,
May 05, 2024 May 05, 2024

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@D Fosse  It's actually supposed to be a cyan-green color. I don't know the exact function of the Lighten blend mode so I could only really translate the output given.

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Community Expert ,
May 07, 2024 May 07, 2024

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»I don't know the exact function of the Lighten blend mode«

Quote from 

https://helpx.adobe.com/photoshop/using/blending-modes.html

»Lighten

Looks at the color information in each channel and selects the base or blend color—whichever is lighter—as the result color. Pixels darker than the blend color are replaced, and pixels lighter than the blend color do not change.«

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