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GrahamH1
Participant
September 1, 2020
Answered

Adobe Camera Raw 12.3 Histogram

  • September 1, 2020
  • 4 replies
  • 907 views

I'm trying to find out how to change the Camera Raw Histogram from RGB to show the Luminosity graph.  Adobe Help can't answer me.  Any help very welcome, thanks.

This topic has been closed for replies.
Correct answer D Fosse

Can't be done AFAIK.

 

The ACR histogram shows the data as encoded into the output RGB color space you set in the workflow options.

 

Luminosity is a Photoshop-specific formula that doesn't directly relate to any standard color space. It is similar to Lab L, but not identical. The actual formula is a weighted mix of R, G and B.

4 replies

TheDigitalDog
TheDigitalDog
Inspiring
September 1, 2020

The ACR Histogram shows RGB and luminosity as seen below left (and you can see Curves shows just luminosity). 

Compare the white part of the Histogram to the final image Histogram in Photoshop set to luminosity:

 

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
elie_dinur
elie_dinur
Participating Frequently
September 1, 2020

Right-click on the histogram and select "Show Lab Color readouts."

TheDigitalDog
TheDigitalDog
Inspiring
September 1, 2020

You may want to check out the Histogram on the Curves panel.

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
D Fosse
Community Expert
D FosseCommunity ExpertCorrect answer
Community Expert
September 1, 2020

Can't be done AFAIK.

 

The ACR histogram shows the data as encoded into the output RGB color space you set in the workflow options.

 

Luminosity is a Photoshop-specific formula that doesn't directly relate to any standard color space. It is similar to Lab L, but not identical. The actual formula is a weighted mix of R, G and B.

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