P: Soft Proof Histogram Displays Incorrect RGB Values

[Todd Shaner]

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...

[Todd Shaner]

Thank you! I can confirm the soft proof values are now correct in LR CC 2015.4.

I also checked PS CC 2015.1.2 and it truncates Lab a b values to the "visible" range of 128 to -127. As suggested by Andrew Rodney it would be preferable if PS displayed the same "full-range" Lab a b values the same as LR, including the added decimal point precision (xxx.x).

It would be helpful if a PS option could be implemented to allow viewing the full range values as displayed in LR (xxx.x) or the current truncated 128 127 range values.

[TheDigitalDog]

The Lab readout's in LR and Photoshop need to match and IMHO, Photoshop needs to behave like LR. I prefer seeing the "actual" Lab values and I prefer the precision seen in LR. I know when I see something outside the "normal" vales I've got a device value that's not a color.

Kind of ironic that the product simplified for photographers provides the Lab readout's as it does while the so called 900lb gorilla that's built for any and every expert user truncates the Lab values and provides less precision of readout.

[Todd Shaner]

Lightroom 6 & CC 2015 added CMYK Soft Proof and JPEG output in the Print module. The Soft Proof values were incorrect in the Develop module, but fixed in LR 6.4 & CC2015.4. This fix apparently broke the CMYK JPEG output in the Print module. See these posts for further information:

https://forums.adobe.com/message/8546554#8546554

https://feedback.photoshop.com/photoshop_family/topics/lightroom-cc-soft-proof-histogram-displays-in...