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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 05 Sep 2013 (Thursday) 22:28
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File Corruption

 
alt4852
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Sep 05, 2013 22:28 |  #1

I've admittedly been a bit absent from these forums for quite some time, but I have a quick poll of opinions for the knowledgeable lot of you. Having already cleared the cards and used them for other work, I encountered a strange block of purple artifacts on one photo during editing. With the other three hundred or so images taken before and after it unaffected, I'm wondering what caused this issue.

When viewed at 100%, it manifests itself as a one-pixel deeply saturated alternating gray and purple layer over the image underneath. For some reason, uploading it to photobucket and resizing it has lessened the color intensity of the distortion.

Is this the first signs of one of my CF cards failing, or was it an error during the writing process from the camera or the transfer to my computer? Considering photos taken afterwards are perfectly fine, I'm assuming it isn't a sensor issue. I had my ST-E3 off for the shot, so I don't think it's a matter of RF interference.

As I wasn't planning on using the shot in the album, it's not a huge loss for me, but I'm wondering if anyone else has experienced this phenomenon and whether I should get in the habit of writing to the CF and SD cards concurrently if there's an impending card failure on the horizon for me. Thanks for any opinions and/or insight!

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joellelee
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Sep 05, 2013 22:38 |  #2

I just posted a similar question! I have the very same coloring on two of my images and am unable to convert about 50 or so RAW from my wedding...I believe due to corruption? They show as downloaded RAW on my zoombrowser BUT will not convert/upload into LR...Hope someone will help us asap!




  
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tzalman
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Sep 06, 2013 02:31 |  #3

Probably failed sector(s) on the card, possibly faults in usb cable, card reader or hard drive. If it's card failure, your screwed, but it's worth trying other hardware to be sure.

Maybe the embedded jpgs are okay even though the Raw data is corrupt. It might be possible to recover them. Try this: http://michaeltapesdes​ign.com/instant-jpeg-from-raw.html (external link)


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Lowner
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Sep 06, 2013 03:01 |  #4

Nothing whatever to do with you question, but I am amused by how sheepish the new husband looks. Like a lamb to the slaughter?


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alt4852
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Sep 06, 2013 08:21 |  #5

joellelee wrote in post #16271923 (external link)
I just posted a similar question! I have the very same coloring on two of my images and am unable to convert about 50 or so RAW from my wedding...I believe due to corruption? They show as downloaded RAW on my zoombrowser BUT will not convert/upload into LR...Hope someone will help us asap!

I'm sorry to hear about your issue, and it sounds much more serious than what I have experienced as mine only affected one file. Best of luck with resolving it, and hopefully you'll find a solution to it soon!

tzalman wrote in post #16272281 (external link)
Probably failed sector(s) on the card, possibly faults in usb cable, card reader or hard drive. If it's card failure, your screwed, but it's worth trying other hardware to be sure.

Maybe the embedded jpgs are okay even though the Raw data is corrupt. It might be possible to recover them. Try this: http://michaeltapesdes​ign.com/instant-jpeg-from-raw.html (external link)

Yea, that's what I'm worried might be the case. To be safe, I think I'll start writing to both CF and SD instead of using it as spillover insurance, and it'll give me more incentive to upgrade my other 5D2 as well. :p

Image data integrity doesn't sound like it's a major risk factor until you experience an issue. I would replace that card immediately if I knew which one it was (I have since formatted them to use for other assignments), but I think building redundancy might be the best course of action for me.

Lowner wrote in post #16272303 (external link)
Nothing whatever to do with you question, but I am amused by how sheepish the new husband looks. Like a lamb to the slaughter?

Yes, there was definitely a personality imbalance between the two. As they had been a couple for close to a decade though, I think they complement each other very well. I did have the challenge of making him smile though, as his sheepish demeanor was just his natural state. Sometimes, photography feels like an exercise in my social skills rather than my artistic abilities. ;)


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Lowner
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Sep 06, 2013 08:29 |  #6

alt4852 wrote in post #16272746 (external link)
Sometimes, photography feels like an exercise in my social skills rather than my artistic abilities. ;)

I've found to be true no matter what business you are in. I was an RYA Yachtmaster Instructor for 14 years and the night before the practical exam I have had to deal with students (grown adults) in tears.


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N2bnfunn
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Apr 18, 2014 00:51 |  #7

First of all I would like to say you did a great job, because as wide as that woman is, I would have thought I only way to get a wide shoot of her would have been with the hubble telescope.. Ok just kidding I found out using nothing but scan disk extreme card I have not problems.

alt4852 wrote in post #16271900 (external link)
I've admittedly been a bit absent from these forums for quite some time, but I have a quick poll of opinions for the knowledgeable lot of you. Having already cleared the cards and used them for other work, I encountered a strange block of purple artifacts on one photo during editing. With the other three hundred or so images taken before and after it unaffected, I'm wondering what caused this issue.

When viewed at 100%, it manifests itself as a one-pixel deeply saturated alternating gray and purple layer over the image underneath. For some reason, uploading it to photobucket and resizing it has lessened the color intensity of the distortion.

Is this the first signs of one of my CF cards failing, or was it an error during the writing process from the camera or the transfer to my computer? Considering photos taken afterwards are perfectly fine, I'm assuming it isn't a sensor issue. I had my ST-E3 off for the shot, so I don't think it's a matter of RF interference.

As I wasn't planning on using the shot in the album, it's not a huge loss for me, but I'm wondering if anyone else has experienced this phenomenon and whether I should get in the habit of writing to the CF and SD cards concurrently if there's an impending card failure on the horizon for me. Thanks for any opinions and/or insight!

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RodneyCyr
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Apr 18, 2014 15:16 |  #8

On cameras with only one memory card, this might be an argument for shooting with both RAW and JPG enabled. This will not protect against total card failure, but it would protect against a problem recording either image.


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walkien
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Apr 20, 2014 18:55 as a reply to  @ RodneyCyr's post |  #9

this happens to me too. there's nothing wrong with my CF cards, I always double check my files after they are downloaded to my hard drive, then I make a copy to my NAS drives and a back up copy to DVDs. Recently, I try to re-edit some files from my hard drive and found out there are couples of corrupted files in there :(, some of them are scanned files from my scanner.


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File Corruption
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