P: Soft Proof Histogram Displays Incorrect RGB Values

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...

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.

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.

Thanks for the verification.

I too can confirm this bug seems to be fixed. I compared a couple of files in LR 5.7.1 and LR CC 2015 9.4 and they were identical. Great!!!

Now we can finally use LR CC in our studio workflow.

Thanks all.

OK, seems to be fixed. ACR set to ProPhoto RGB (workflow options) and LR set the same in a soft proof produce the same values now on a Macbeth red. Yeah.

Downloading now to check Jeff.
NOT listed that I see on your site of bug fixes for this build:

Fixed several instability, functionality and performance issues introduced in Lightroom CC 2015.2.x/6.2.x.
Fixed a bug that caused edits made and saved in Photoshop or 3rd party plug-ins to not appear in the Develop module.
Fixed a bug related to user default for Chromatic Aberration Correction no longer honored after new Import option was removed.
Fixed several bugs related to Panorama Merge.
Fixed a bug so that Rotated photos will correctly show as rotated when in Full Screen view.
Fixed a bug that caused a performance slowdown when creating Standard sized previews on high resolution monitors.
Fixed a bug that caused image previews to be incorrectly displayed as completely black after import if “Auto Tone” is on in preferences.
Fixed a bug that caused crash when using the Radial or Graduated Filter.
Fixed a bug that caused Palette, a 3rd party hardware device, to stop working with Lightroom.
Fixed a bug that caused the Map module to appear pixelated and photos to be dropped in the wrong place when using hi-dpi monitors on Windows.
Fixed a bug related to Full Screen that prevented you from exiting Full Screen view while using the Spot Healing Tool.
Fixed a bug that caused the Flickr Publish Service to improperly publish multi-word keywords.

The Photoshop Lab value read out's were designed long before synthetic RGB working spaces like ProPhoto, that define values that are not colors existed.

There's nothing inherent 'wrong' truncating' the Lab values as they are actually defined as we see in Photoshop. It's somewhat useful to see that a value that exceeds 128-127 as it informs the user these are not colors but device values. None the less, what Adobe really must do is make Lightroom and Photoshop behave the same and they haven't. So I'd kind of prefer to see Photoshop's info palette updated to act like LR's, along with the added precision. I've requested this, nothing yet.

Andrew, thanks for the clarification. If PS and LR used the same Lab values it would be more helpful. Is this just a legacy compatibility issue in PS? If so perhaps a Preferences option to use the restricted 128 -127 "visible" values or the 'full-range' values would be a nice feature for LR users.