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How have same intensity value when copy RGB "gray" into single channel?

Explorer ,
Jun 02, 2021 Jun 02, 2021

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I assume it's something in color settings?  

Right now if it try to copy a Layer comp in RGB document  with something saying , rgb 128,128,128     it pastes  to alpha channel not 50% K  but rather 59%.

 

How can I make it 50% and same exact combined/percieved  intensity as  in RGB  when copy/paste to grayscale channels  in any part of  a spectrum?  

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correct answers 1 Correct answer

Adobe Community Professional , Jun 02, 2021 Jun 02, 2021
Set in ColorSettings WorkSpace for Gray: Gray gamma 2.2.

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Adobe Community Professional ,
Jun 02, 2021 Jun 02, 2021

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Might you be confusing the L-Channel in Lab with grayscale? 

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Explorer ,
Jun 02, 2021 Jun 02, 2021

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No, What I am trying  to do  is "copy merged" of rgb layers and adjustments ( looking like grayscale in a RGB/16 document  using default sRGB profile) and paste into an alpha channel of also RGB tga file

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Explorer ,
Jun 02, 2021 Jun 02, 2021

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both files have "workig SRGB"      I wonder what photoshop copies  when you do ctrl+C   , actual picxel values or something view transformed ? 

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Adobe Community Professional ,
Jun 02, 2021 Jun 02, 2021

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What were your Grayscale Working Space and the RGB image’s Color Space? 

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Adobe Community Professional ,
Jun 02, 2021 Jun 02, 2021

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Set in ColorSettings WorkSpace for Gray: Gray gamma 2.2.

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Explorer ,
Jun 02, 2021 Jun 02, 2021

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Thanks . it 's working

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