Embedded preview corruption

Explorer ,
Jun 15, 2021 Jun 15, 2021

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Hi

 

Why when i press 'Embedded Preview' burron on the image in Library mode, do my images get visibally corruped? If i remove that image from Lightroom and resync, its ok again.

Lightroom up to date. 

Example attached.

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Bug, Mac, Problem or error, Sync

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Adobe Community Professional ,
Jun 15, 2021 Jun 15, 2021

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That's not normal. Are your graphics card drivers up to date?

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Explorer ,
Jun 15, 2021 Jun 15, 2021

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thanks for the fast reply, i dont know, im using a mackbook pro, ive used it for years. it gets all the updates recommended. never seem to have to look for drivers (unlike a PC)

 

Using , NVIDIA GeForce GT 650M 1 GB graphics

 

 

 

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Adobe Community Professional ,
Jun 15, 2021 Jun 15, 2021

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As John has indicated, the issue is probably related to the graphics card drivers. Unfortunately, Apple's fallout with nVidia means that updated drivers for their cards is long since a thing of the past (I think Mojave was the last OS that Apple provide nVidia updates). You could try diabling GPU support in Lightroom Classic Prefernces Performance tab, as doing so may help. 

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Explorer ,
Jun 15, 2021 Jun 15, 2021

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wonderful, well, thanks, I'll see how it goes.

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LEGEND ,
Jun 15, 2021 Jun 15, 2021

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Using , NVIDIA GeForce GT 650M 1 GB graphics

 

 

Is the option to use Graphics Processor on? That 1 GB is low for that, might not work at all, or might cause issues.

 

Also, a fairly old GPU with poor driver support via Apple, so might be buggy if use Graphics Processor is on.

 

If on, try off.

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Adobe Community Professional ,
Jun 15, 2021 Jun 15, 2021

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If I understand your descriptions, I might suggest that your photo files are corrupted.

The good image you see, the 'embedded' camera preview may look OK when you import, or even when you re-import, but as soon as you click the 'embedded' icon you are forcing Lr-Classic to build a Preview from the raw data. It is the raw data that is corrupt.

ie. a 'good' embedded view, 'bad' raw data.

You need to investigate where the corruption is occuring- Camera? Memory Card? USB cable?.

See a similar forum thread here-

CORRUPT FILES- BAD CAMERA SENSOR

 

Regards. My System: Lr-Classic 10.3, Photoshop 22.4.2, Lightroom 4.3, Windows-10 Nikon DSLR.

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Explorer ,
Jun 15, 2021 Jun 15, 2021

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willing to accept the possibility, but how come they are now ok?

Ive gone into Lr today and they seem ok, so i deleted two that i remember definately had the issue, reimported them and pressed the embedded preview button and they were fine.

So i guess? the raw file is ok?

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Explorer ,
Jun 15, 2021 Jun 15, 2021

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Is there a bit of software that i can test my Lexar DF card with?

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Adobe Community Professional ,
Jun 16, 2021 Jun 16, 2021

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I would be checking the Hard-drive for errors or failures- bad disk sectors?. That you can re-import 'good' images suggests that the Lexar Card is OK, but the file after import to the hard-drive is corrupting. And that might be random also.

(Me- not aware of software to check the DF card- sorry.)

 

Regards. My System: Lr-Classic 10.3, Photoshop 22.4.2, Lightroom 4.3, Windows-10 Nikon DSLR.

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Explorer ,
Jun 16, 2021 Jun 16, 2021

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Thanks for the tip, so i just went in to recovery mode and ran first aid on teh SSD, and there were no errors

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Adobe Community Professional ,
Jun 16, 2021 Jun 16, 2021

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So I am out of ideas, others having suggested Graphic Card updates. (And my experience is only with Windows-PCs)

In an old forum post- a Windows user did a 'Quick scan' of a drive that indicated "All Good", but a later 'deep scan' revealed failing sectors, so I would not rule out failing hardware seeing "no errors".

All the gurus will say that it is not Lightroom-Classic that causes the file corruption, but it is mostly hardware related.

And to summarize what I have learnt (from my notes)-

Lightroom is very good at detecting Hardware issues.

Corruption can occasionally occur through a hardware problem, most often in the chain from camera through to Lightroom. Identification of the problem cause is usually a troubleshooting challenge of trying to swap out some of the items in that chain.

Try importing the photos again from the camera card, using different hardware (and to a whole different computer if possible) to see if you can isolate the bad piece of hardware.

If the Camera or Card reader is connected by a USB cable, the cable itself could have broken wiring inside. Try different cables to see if the hardware error is limited to the USB cable.

The camera card itself could be bad.  Try a different SD or CF card?

Also inspect the computer RAM. Computer RAM memory can go bad over time and running a memory test could be helpful in determining if your RAM is failing.

And the destination Hard Drive- Test to verify the integrity of the disk drive. Test for bad sectors on the hard drive.

If files are showing up bad on different cards it could indicate a problem with the camera.

A known case determined it was a bad sensor on the camera and returned the camera for a fix.

 Note: The camera, and many file browsers, only show you the JPG preview that is embedded in the RAW photo, which is often uncorrupted and appears OK, even when the RAW data in the file is corrupted. It is the RAW data that Lightroom reads.

Regards. My System: Lr-Classic 10.3, Photoshop 22.4.2, Lightroom 4.3, Windows-10 Nikon DSLR.

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Explorer ,
Jun 16, 2021 Jun 16, 2021

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thanks for the detailed reply, im very familiar with fixing PC's, not so familiar with mac's . id run a deep scan on SSD if i knew what software to use.

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Explorer ,
Jun 23, 2021 Jun 23, 2021

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LATEST

i havent had the problem since, so havent bothered doing anything else.

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