Participating Frequently

P: Spot Removal Brush Render Glitch When Converted to Compressed DNG

Forum|Forum|5 years ago
March 2, 2021
28 replies
2598 views

I am consistently finding all spot removal adjustments rendered as pink block artifacts after converting to compressed DNG. I am using LR Classic 10.1.1 on a 2017 15 inch MacBook Pro running macOS Catalina 10.15.7. I've seen the problem with a Canon R5 (raw and c-raw), Canon 5DmkIII, and Fuji X-T3 (RAF). The artifacts don't immediately appear - only when rendering 1:1 - so they are easy to overlook. I can remove the artifacts by modifying each spot removal adjustment in some way (often I'll just select an adjustment and nudge the feather slider up and down by one so the adjustment isn't affected). Also, there doesn't seem to be a problem when adding spot removal adjustments to images after they are converted to compressed DNG. Not sure how long this problem has been around - I've just discovered it when testing compressed DNG as a possible way to manage file sizes from the R5. Here are screenshots showing the original raw, compressed DNG, and exported PSD...

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Wurstkrapfen

Inspiring

So it's known since 2 years and nothing happened? Did my post just got archived and forgotten like the other confirmed bugs?

Wurstkrapfen

Inspiring

After doing lossy compression in LR classic on some dngs a lot of my edits show these green artifacts.

They show in preview and the developing module. They appear only in places where I used the repair/clone tool before.

If I export the whole image it is unharmed (luckily).

Still this should not happen.

Wurstkrapfen

Inspiring

It's fixing itself if I move the source area to fill in one pixel, but gets green again if I move it back to it's original position.

J

jeffreym86671824

Participant

One more thing, I am pretty sure it's a LR bug rather than a DNG bug since it looks fine on ACR or Photoshop as is. If you delete the "healing" spots, the pink/red boxes disappear and reveal the original image of the exported lossy DNG from original yet updated DNG to contain LR edits. It strongly suggests it's more of a LR having issues with rendering lossy DNG files that contain spot healing metadata than the DNG format itself.

J

jeffreym86671824

Participant

I just updated my LR Classic to 11.5 and I still see the artifacts after exporting to lossy DNG where the retouched areas were. Opening the same image in Camera RAW or Photoshop does not show it. Only in LR.

R

raoulcos

Participating Frequently

Thanks. I couldn't quite find the right description when I searched for the issue, but just as well I posted it, because they haven't fixed it...

R

raoulcos

Participating Frequently

I just exported the file as a .jpg and now the pink blocks no longer appear in LR Library E or G mode

R

raoulcos

Participating Frequently

These strange pink pixel blocks (not sure what else to name them) appear on this image, only in Library mode. Switching to Develop mode, they disappear. I figured out what the issue is, but not why: the blocks are in exactly the same positions that I used the Spot Removal tool. So Library mode displays Spot Removal from Develop mode as pink blocks. It should also be noted that I converted the RAW .NEF files to .DNG.
This is definitely something buggy that I have not seen before. The screenshots are attached. Thanks

R

raoulcos

Participating Frequently

LR Classic V11.4.1
MacOS 12.4

Todd Shaner

Legend

This issue has already been reported and logged as a bug. There is a workaround you can use for now as outlined in my reply above.

Re-exporting the affected lossy DNG files as shown below with Embed Fast Load Data unchecked appears to fix the issue without touching the image data. You can do this as a batch export to a subfolder, then delete the original lossy DNG files and move the new files to the original folder.

T

Treefrog Photography

Known Participant

When converting CR3 files to DNG, all the Spot Removal instances turn into black or some other colour square. Coverted using Lossy conversion on a Windows 11 machine using Lightroom Classic 11.2.