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Todd Shaner
Todd Shaner
Legend
Apr 29, 2015 6:24 PM UTC
Released

P: Soft Proof Histogram Displays Incorrect RGB Values

The LR CC Soft Proof RGB values shown in the Histogram are incorrect when the cursor is hovered over a specific area of the image. It does not matter what color profile is used or if the ' Graphics Processor option is enabled or disabled in LR Preferences. The values remain the same and incorrect regardless of the Profile selected in the Soft Proofing panel.

The Soft Proof Histogram appears to display the LR Native Color Space values (Melissa RGB) without RGB data conversion to the Profile color space setting in the Soft Proof panel. Please see this post for further details:

https://forums.adobe.com/message/7489...

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    28 replies

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    TheDigitalDog
    TheDigitalDog
    Inspiring
    Jan 23, 2016 10:35 PM UTC
    This issue was reported last April!
    https://forums.adobe.com/message/7494...
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    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    TheDigitalDog
    TheDigitalDog
    Inspiring
    Jan 23, 2016 10:32 PM UTC
    The numbers provided in the soft proof ARE wrong, it's a known bug that should be fixed in the next release.
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    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    TheDigitalDog
    TheDigitalDog
    Inspiring
    Jan 23, 2016 10:28 PM UTC
    That -172.3 value is kosher for a 'color' value (device value) in a color space like ProPhoto RGB that isn't a visible color. PS truncates to 127 and -128 because those are legal and actual visible color values, B255 in ProPhoto RGB isn't.

    >>Can you explain B255 not being a visible color value in more detail?

    http://digitaldog.net/files/ColorNumb...
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    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    Todd Shaner
    Todd ShanerAuthor
    Legend
    Jan 23, 2016 12:38 PM UTC
    Team Adobe Engineering I have discovered another issue with the Histogram values when NOT in Soft Proof mode. A 100% Blue Lab 0, 90 -128 (RGB 255, 0, 0) reads 0.1, 90.1, -172.3. The maximum Lab a b values are 127 to -128......-172.3 makes no sense and is incorrect!
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    Todd Shaner
    Todd ShanerAuthor
    Legend
    Dec 4, 2015 1:29 PM UTC
    Thank you Kelly–Much appreciated.
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    Kelly Castro
    Adobe Employee
    Kelly Castro
    Adobe Employee
    Dec 4, 2015 1:23 AM UTC
    Hello All,

    I apologize for the delay in addressing this issue (it was unfortunately overlooked and only brought to my attention last week). We were able to reproduce the issue in-house and identify the problem. A fix has been implemented and will be included in the next release of Lightroom. Thank you for bringing it to our attention.
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    Kim Brun
    Inspiring
    Nov 20, 2015 1:17 PM UTC
    This is not an operator error. This is a software bug. Please accept this.
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    Community Expert
    Jao vdLCommunity Expert
    Community Expert
    Nov 19, 2015 10:51 PM UTC
    Simon, the display is correct. The RGB readout is not. this is even true for proofing to the built in sRGB and adobeRGB profiles. This is also a problem with every single external profile. LR 5.7 did this correct. 2015 CC and 6 have a bad bug in the RGB display.
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    Todd Shaner
    Todd ShanerAuthor
    Legend
    Nov 19, 2015 9:58 PM UTC
    Every profile shows the same RGB values in the Soft Proof histogram. See this post https://forums.adobe.com/message/7493...
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    Kim Brun
    Inspiring
    Nov 19, 2015 9:56 PM UTC
    This problem is across many machines in two different studios all using the same profiles all having the same issue. If you read all the other user's experiences you will note they are the same. It does not appear to be a profile issue unless we are all having the same profile corruption across many both PCs and Macs.
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