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Todd Shaner
Todd Shaner
Legend
April 29, 2015

P: Soft Proof Histogram Displays Incorrect RGB Values

  • April 29, 2015
  • 28 replies
  • 1541 views

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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    K
    Kim Brun
    Inspiring
    November 19, 2015
    You seem not to understand the problem. It is not a profile issue.
    S
    Adobe Employee
    simonsaith
    Adobe Employee
    November 19, 2015
    The profiles that work fine in PS does not necessarily mean Lr would like it. PS might be using a slightly different API that might be more tolerant. With an EPSON RGB color profile applied, I see Lr read out different RGB values (after conversion) when toggling soft proofing on and off. Does the image render for the softproofing look correct to you? Or the problem is just the RGB read out.

    If you can share the color profile somewhere, I'd be happy to take a look.
    K
    Kim Brun
    Inspiring
    November 19, 2015
    Jao - It is still a problem. Simon - profiles are identical in all versions and when opened in Photoshop. It is an color engine problem as far as I can determine. Only work around is not use LR 6.x or LR CC any version!
    J
    Community Expert
    Jao vdLCommunity Expert
    Community Expert
    November 19, 2015
    Simon, this is a real bug introduced with LR 2015/6 and happens with all profiles. The RGB display is incorrect. I haven't checked yet in 6.3 but Kim's report seems to indicate it is still a problem.
    S
    Adobe Employee
    simonsaith
    Adobe Employee
    November 19, 2015
    Make sure your destination color profile is good. We have heard some similar report only to find that the color profile is not wellformed/corrupted. Sometimes it helps to use Apple's ColorSync Utility to repair the profiles.

    Is it happening on a particular color profile or happening on all profiles?
    K
    Kim Brun
    Inspiring
    November 18, 2015


    LR CC 2015.3 and LR 6 have a bug in the Soft Proofing feature. Neither will display the correct RGB values in the Histogram window. However, LR 5.7.1 and earlier do. However, when the file is exported to Photoshop the RGB values and histogram are correct. This bug has been discussed in several forums since April 2015. This is an essential component for our studio. We need to accurately evaluate each file to meet our clients needs and to insure the product is properly reproduced. We have not update our production machines because of this bug. And can not update them until it is fixed.
    J
    Community Expert
    Jao vdLCommunity Expert
    Community Expert
    October 20, 2015
    I can confirm the issue. The RGB numbers are incorrect in soft proof in LR 2015.
    K
    KBStudio
    Inspiring
    October 20, 2015
    I have tried getting Adobe's attention via Lightroom's forum only to be told they do not review the posts there. So here are links to several posts I have made concerning this problem. I have posted examples so that you can appreciate the issue particularly for a professional studio which depends on accurate RGB values.

    https://forums.adobe.com/thread/1936393
    http://www.canonrumors.com/forum/inde...
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