What's wrong with this RAW/NEF picture
Yesterday I went to Napa county to photograph the vines and mustards. I have two or three images that got messed-up with horizontal multi-color lines in the bottom of the images. Any ideas what causes these lines?
I have attached one image for you to see the lines. Any input will be greatly appreciated.
Attachment#1 (jpg file)
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#1. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 0stappy Nikonian since 06th Aug 2009Fri 01-Mar-13 05:54 PM
This appears to be a corrupt file which could be a memory card going bad, a problem transferring the file (ie bad cable) or a problem with the camera's writing ability. Most likely it is the first. If you have a card reader on your computer you can run a check disk on the memory card and scan for bad sectors. If it finds any errors then your diagnosis is complete. If not, I would switch memory cards and see if it continues. Was this transferred using the camera or using the card in a reader?
Also remember that depending on the processing software you are using, you may only be looking at the jpg file that is embedded into the NEF file. It is possible that the NEF itself is still good.
#2. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 1montevideano Nikonian since 24th May 2011Fri 01-Mar-13 06:30 PM
Thank you very much for your prompt response.
Usually, I connect the camera to my computer and download the pics (RAW files) to a backup drive. Then, a copy that folder to my Lightroom directory, and upload the pics to Lightroom.
I'll check the card to see if it has any bad sectors.
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#3. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 2stappy Nikonian since 06th Aug 2009Fri 01-Mar-13 06:51 PM
Lightroom builds its own jpg file when you import the image, so if it shows corrupt in Lightroom then the actual raw file is corrupted. ViewNX would not.
If you use the camera to view the file on the LCD screen, does it look ok there? That would be the jpg file embedded by the camera into the NEF file. You would also be viewing this when you see a thumbnail in a file folder. If the LCD or thumbnail looks ok, then that would rule out any sensor or camera processing problem ( except writing) since the camera builds this jpg before writing the file.
#5. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 2Scotty Nikonian since 07th Feb 2002Sat 02-Mar-13 02:53 PM
I would suggest changing your download procedure - buy a card reader, download using this, once pictures are on computer, put the card back in camera and format the card in the camera. This helps avoid some corruption issues and saves the camera battery...
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#4. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 0
In addition to the above, I would try a new USB cable. You have some electrical defect somewhere, and this is the easiest and cheapest to diagnose. Spare cables are always a good thing to have in the tool box.
Also try a different USB port (edit: on the computer) to isolate a problem with the USB port in your computer.
If that does not solve the problem, try a card reader. If that fixes the problem after swapping cables and USB ports, then the problem is likely the USB port in the camera. That is probably an expensive repair so a card reader would be the most economical solution.
If that does not fix the problem, and it happens with other cards, then it could be a weak pin in the camera's card holder. Or perhaps some other internal problem, and that would be the worst of all possible outcomes. Worst because it would require an expensive camera repair if the camera is out of warranty.
If it were me, I would get some software like BeyondCompare to bit verify all the images, between the card and the target copy on the computer. Or you could use something like Teracopy to copy and automatically bit verify the target file. I use both apps for a number of things but don;t currently have a need to bit verify my images. If I even once had your problem I would do that.
Those are Win apps. If you use a Mac then there are probably alternatives to do the same thing.
The only problem with bit verifying is that you can't do any file renaming or IPTC embedding during your ingest. Otherwise nothing will match. But unless you edit every image you may not know if you have a corrupt image before you erase or reformat the card. Unless, of course, your Lightroom workflow forces that (and it may).
If you use compressed raw, either lossy or lossless, then it only takes one flipped bit to destroy an image. I've tested that idea and know it to be true.
It is possible that shooting uncompressed raw will not result in a destroyed image if only one or a few bits are flipped. We've talked about that idea here but I haven't tested the idea, nor do I recall anyone else doing that. But in a pinch, if you cannot solve the problem, that might be worth a try. Otherwise you might try shooting Raw+JPG Large Fine just to make a backup copy of each image.
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#6. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 0
My D70s did the same thing - in that case, it was the CF card slot, which got worse over time with any card I put in the camera
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#7. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 6
#8. "RE: What's wrong with this RAW/NEF picture" | In response to Reply # 0
Some time ago i had same problem. I was using SD to Compact Flash adapter. Randomly it corrupted images. I got rid of this and buyed a real Compact Flash Card and the problem gone.