Lightroom: Canon t2i raw file thumbnails are scrambled

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  • Updated 2 years ago
  • (Edited)
When I import CR2 files from my Canon t2i, the initial previews look fine but then get scrambled when the RAW data loads. I've tried different cards, different card readers. I am using Mac OS 10.10.1 Yosemite.

Someone suggested I trash the LR preferences file, I tried it with no success.

I tried importing CR2 files into Capture One, and it works fine.

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Jeff Hayward

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Posted 4 years ago

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Would it be possible to share a link to one of the files via Dropbox, Creative Cloud or another sharing service?
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Jeff Hayward

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Rikk Flohr, Official Rep

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This has the classic look of a corrupt file. Most likely causes are:

Bad Card
Bad Cable
Bad Port
Bad Harddrive

Given that you've tried different cards and different readers, I am going to lean towards either your camera or your computer having a defect.

The file you uploaded into Dropbox isn't a CR2 file and that is what we need to see to help diagnose the problem.

As far as your Capture One upload looking fine, have you tried to edit one of these files in C1? Export one?
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Jeff Hayward

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https://www.dropbox.com/s/w4cka3gn0cf...

here is one of the CR2 files
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Jeff Hayward

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also, yes i have imported into Capture One and exported as Jpeg just fine, did some snow shots this mornings. Snow... ech.
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This file looks fine here in Lightroom 5.7.1 Does this exact file show correctly or incorrectly in your Lightroom catalog?
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Jeff Hayward

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that was a bad example, sorry. here is one that looks scrambled in LR library preview, but looks normal on desktop as thumbnail.

https://www.dropbox.com/s/wzrlimrcdcm...
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Hi Jeff, I can't get this file to render with an raw rendering engine I have access to (Preview, Picassa, etc), not just Lightroom or Camera Raw.
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Rikk Flohr, Official Rep

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On this file, the JPEG preview is intact. The Raw file is not. Again, it looks like classic data corruption. Describe where this file came from, please. From Camera to Dropbox,what steps did you take? How did you connect, etc.
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iDeMi

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I have seen simular behaviour with some CR2 RAW files that where converted to DNG. Because I don't have the CR2 RAW files anymore I cannot say what caused the problem. Since then I always create a second copy of my RAW files when importing in order to:
1 - be able to recreate the DNG file
2 - know where the problem is (corrupt RAW or corrupted DNG)
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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I tried C1, too and got this with your file:

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Jeff Hayward

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ok, i'm starting over again.

i took some photos this morning. i first imported all the photos from the camera using a card reader right onto my desktop, to have a backup copy.

i then imported from the camera (using card reader) into LR and C1.

here is a raw CR2 file from this morning's shoot:
https://www.dropbox.com/s/djwffgjbfk4...

here is the jpeg export from C1:
https://www.dropbox.com/s/4olf48lzq2w...

here is the jpeg export from LR:
https://www.dropbox.com/s/dxuqsq1jcs3...

hope this illustrates the problem better.
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Rikk Flohr, Official Rep

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Not really, Jeff.

I can bring your Raw into Adobe Camera Raw or Lightroom and it looks fine. My JPEG export of your Raw file via Lightroom looks fine too. See attached.

The question I have now is did you import the photo separately into Capture 1 and Lightroom or did you import the photo once and just open it both?

(Sorry I forgot to turn off the signature watermark...)
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Jeff Hayward

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i imported the photo separately into C1 and LR. so an original was imported into both straight from the camera via card reader.
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Jeff Hayward

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i have also uninstalled and reinstalled my copy of lightroom. maybe i should try it again.
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Rikk Flohr, Official Rep

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Now, here's the test I would like to see. Presumably, the two raw files are now located in two different locations on your disk.

If you import the file originally brought into Capture One and import it into Lightroom using Add rather than copy, what happens?

If you import the file (corrupt) originally brought into Lightroom and import it into Capture One, what happens?
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Jeff Hayward

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when i drag a photo from lightroom library into C1, i get the image attached.

when i drag a photo from C1 library into LR, it looks perfectly fine!
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Rikk Flohr, Official Rep

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What happens if you don't drag but rather import the photo from Capture One into Lightroom without it moving physically on the disk? (Using Add in the Import Dialog instead of Move or Copy)
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Jeff Hayward

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i'm having some trouble finding where C1 stores its files. i see the catalog folder but don't know how to access the content...
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Rikk Flohr, Official Rep

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Jeff,

I have a suspicion, only a suspicion-mind you, that you have a hard drive failing. Ideally, what I would like to see, to test this, is for Lightroom and Capture One to be reading the same raw file from the same location on disk - not two different locations as I suspect you are seeing now. If we can confirm that the two programs are reading the identical file and doing so differently that tells us something.
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Jeff Hayward

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ok, so i created a new export folder for C1 (so it doesn't save in a catalog where individual files can't be accessed). i then imported some new test shots into that folder.

i then opened LR and using the add command, imported them from the new C1 export folder. they imported looking fine into LR. no problems.

then i tried again to import the same photos into LR from the card reader, they are all corrupt again.
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Jeff Hayward

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i just wanted to add my computer is just over a month old, imac running yosemite 10.10.2.

i would be very surprised if i had a hard disk failure.
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Jeff Hayward

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any more suggestions for me? i've established that LR and C1 can read the file from the same location on the HD without a problem. i'm at a loss.
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Jeff Hayward

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i just tried another solution that seems to work, but there's an extra step involved.

instead of importing into my pictures/default folder on LR, i first dragged all the photos from the card onto the desktop, and then added that folder from the desktop to LR.

so, i suppose in a way my problem is solved!
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Thomas

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Hey Jeff,
did you know now exactly what the problem was? I have the same problem with Mac OS 10.10.3 Yosemite and with Canon eos 5d mark III. Which Mac did you use? I think it is a graphic card problem with newer versions of LR and PS.
I try to find the problem with some guys of CPS(Canon Professional Service). We changed the Camera Mainboard, we used different cards and card readers and different Systems. It seems that this problem occurs just with Mac never on a Windows PC. It would be great if i would hear from you... Thomas
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Jeff Hayward

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hi thomas, i don't know exactly what happened. all i know is that if i import to my desktop from the card, and then import from desktop into LR, it works fine. there is no other explanation. i suspect it to be a yosemite problem too, not a hardware issue.
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Thomas

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hi jeff,
thank a lot for your reply!!!! a yosemite problem is a good hint! anyway, could you tell me which mac do you use? it would be really awesome to know and to suspend some things... THANK YOU A LOT JEFF
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Jeff Hayward

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see the image below to see all my details
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Jackie Donnelly

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Thanks from me, too! Having this same issue on a Mac. I will save to the drive first, then import into Lightroom and see if that works.
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Jeff Hayward

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Thomas

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Thank you!