Highlighted

Saturation in Photoshop

New Here ,
May 27, 2017

Copy link to clipboard

Copied

I have two fully saturated colours: yellow and ultramarine. If I reduce both their saturation to 0% I end up with two greys of the exactly the same tone.

But because yellow has a higher luminance than blue, shouldn't the yellow without any saturation be brighter than the blue?

[Moved from the Color management forum to a Photoshop forum - moderator]

Adobe Community Professional
Correct answer by D Fosse | Adobe Community Professional

You're right, but this is how the RGB model works. It just averages values.

Convert to Lab first, and you'll get the inherent luminance right.

desaturation.png

Views

147

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more

Saturation in Photoshop

New Here ,
May 27, 2017

Copy link to clipboard

Copied

I have two fully saturated colours: yellow and ultramarine. If I reduce both their saturation to 0% I end up with two greys of the exactly the same tone.

But because yellow has a higher luminance than blue, shouldn't the yellow without any saturation be brighter than the blue?

[Moved from the Color management forum to a Photoshop forum - moderator]

Adobe Community Professional
Correct answer by D Fosse | Adobe Community Professional

You're right, but this is how the RGB model works. It just averages values.

Convert to Lab first, and you'll get the inherent luminance right.

desaturation.png

Views

148

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
May 27, 2017 0
Advocate ,
May 27, 2017

Copy link to clipboard

Copied

Maybe try to use Black White - adjustments - this way you can adjust any colors and prepare perfect grayscale picture

Pawel

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
Reply
Loading...
May 27, 2017 0
Adobe Community Professional ,
May 27, 2017

Copy link to clipboard

Copied

You're right, but this is how the RGB model works. It just averages values.

Convert to Lab first, and you'll get the inherent luminance right.

desaturation.png

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
Reply
Loading...
May 27, 2017 1
New Here ,
May 28, 2017

Copy link to clipboard

Copied

Awesome! Thank you so much 😄

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
Reply
Loading...
May 28, 2017 0
Adobe Community Professional ,
May 28, 2017

Copy link to clipboard

Copied

Or just use the Fade Command after using Saturation in RGB, pick a blend mode like Color or Saturation. Not exactly the same as converting to Lab but, no conversion to Lab which is something you don’t want to do with 8-bit per color data!

Likes

Translate

Translate

Report

Report
Community Guidelines
Be kind and respectful, give credit to the original source of content, and search for duplicates before posting. Learn more
Reply
Loading...
May 28, 2017 0