LR BUG? More noise in LR than in Photoshop when loading JPG

Nov 12, 2018

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Hi all!

When loading JPEG in lightroom, I can see noise shaped like short horizontal segments of lines.

This does not appear in other images viewer such photoshop or GIMP. Is it a Lightroom BUG ?

how to avoid this bad looking noise ?

Here is the comparison, I increased the contrast so you can see it easily:

Left: Lightroom (Classic CC Version 1.4, Camera Raw 10.4), top right: photoshop.

more_contrast.png

GIMP behave like photoshop.

Here is the original picture:

original_cropped.jpg

Thanks for your help.

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Nov 14, 2018

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Did you edit the image in Photoshop, create some layers in Photoshop, then save with the layers? Then back to Lightroom?

mid 2015 MBPr 15” 16GB MACOS 10.15.3; 4K EXT DSPY; CAM: Canon 5D Mk III, Fuji X-T3>Just another Adobe customer; My Sys; APP: LRC 9.2.1, PS 21.1.3; CMP: WIN WS 16GB OS 10.0.18363,
mid 2015 MBPr 15” 16GB MACOS 10.15.3; 4K EXT DSPY; CAM: Canon 5D Mk III, Fuji X-T3

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Adobe Community Professional ,
Nov 14, 2018

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It doesn't matter what was done to create the JPG.

The point is that the same JPG is being used as input to LR/ACR-plug-in vs ACR-filter with the same settings applied and it looks different between the two.

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Adobe Community Professional ,
Nov 14, 2018

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ssprengel  wrote

It doesn't matter what was done to create the JPG.

The point is that the same JPG is being used as input to LR/ACR-plug-in vs ACR-filter with the same settings applied and it looks different between the two.

The only difference between the two methods is what code read the jpeg. If you use ACR as filter, the image data was already loaded into a Photoshop buffer and that data gets run through the ACR code. If you open the jpeg directly in ACR or Lightroom, it uses it's own jpeg decompression code instead of Photoshop. That is perhaps where the problem occurs.

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Nov 15, 2018

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https://forums.adobe.com/people/Jao+vdL  wrote

ssprengel   wrote

It doesn't matter what was done to create the JPG.

The point is that the same JPG is being used as input to LR/ACR-plug-in vs ACR-filter with the same settings applied and it looks different between the two.

The only difference between the two methods is what code read the jpeg. If you use ACR as filter, the image data was already loaded into a Photoshop buffer and that data gets run through the ACR code. If you open the jpeg directly in ACR or Lightroom, it uses it's own jpeg decompression code instead of Photoshop. That is perhaps where the problem occurs.

There is another possible difference. Comparisons are being done at 400% and it can't be assumed that PS and LR/ACR use the same up-sizing algorithms. I find it hard to react seriously to artifacts and "bugs" that are only visible at 400%.

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Adobe Community Professional ,
Nov 15, 2018

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In my reply #9 I was able to get a good rendering after making some LR adjustments so perhaps not a "big issue." However, there's no question LR/ACR and PS are rendering the JPEG image data in this file differently.

I can clearly see the artifacts at 100% view in PS. Using 'Edit in PS' with 'Edit a copy with LR Adjustments' shows the same line-artifacts inside PS. I checked ProPhoto RGB 16 bit and sRGB 8 bit 'External Editing Preferences' with no settings applied. This eliminates the LR display path as the source so it appears LR is reading the JPEG image data differently than PS.

(click on image to see full-size)

photo-47299817-001-002-003-100% View Comparison.jpg

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Nov 15, 2018

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Thanks Todd, you have my point: JPEG is a standard, two different image viewers should show the same image the same way. I tried a bunch of viewers and all agree with photoshop. Only LR differs, there must be a bug in the code reading JPEGs in LR.

Are you guys working inside Adobe ? could you report the bug to the Lightroom team ?

Thanks for you help!

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Adobe Community Professional ,
Nov 15, 2018

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You can report this as a 'Problem' at the below forum, which is monitored by Adobe Engineering. You'll need to provide more information on how the JPEG file was created and if the original is a raw file. You'll need to upload both files to a file sharing site and provide the share link in your report. Please also place a link to this LR forum post in your report and when completed place a link to the Photoshop Family report in a reply back here. Thank you!

Photoshop Family Customer Community

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Jao_vdL LATEST
Adobe Community Professional ,
Nov 15, 2018

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Todd is right. We do need know how this jpeg was created. I have not been

able to get anything similar to happen with any of my own jpeg files and I

always seem to get basically identical rendition between LR and photoshop.

This jpeg behaves differently though. It is unclear why.

On Thu, Nov 15, 2018 at 10:24 AM Todd Shaner <forums_noreply@adobe.com>

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Adobe Community Professional ,
Nov 14, 2018

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Here are screenshots. This is Lightroom with ONLY a curves adjustment:

Screen Shot 2018-11-14 at 10.02.44 PM.png

Here is Photoshop with basically identical curves:

Screen Shot 2018-11-14 at 10.04.48 PM.png

No line artifacts in PS.

The artifacts are visible in exports from Lightroom but not in Photoshop. You do get the same artifacts in camera raw if you dial in the same curves:

Screen Shot 2018-11-14 at 10.11.50 PM.png

This might be that the math in Photoshop in only 8-bits precision is not capable of showing the artifacts that are there in the original file, so  I tried opening the jpeg directly in Photoshop, converting to 16-bits and doing the same curves but you still don't see the artifacts in that case. Something is different in how Lightroom and ACR read these jpeg files from Photoshop.

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Adobe Community Professional ,
Nov 14, 2018

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Thanks ssprengel that confirms it is a general thing and not Mac only or dependent on GPU or some strange thing like that.

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Adobe Community Professional ,
Nov 14, 2018

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Thanks ssprengel. You can actually see the artifacts in Lightroom without doing any edits. No artifacts in Photoshop. I only did a tone curve here. No sharpening needed. I can't get these lines in any other editor so it is LR/ACR specific.

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