Luminous Landscape Forum

Equipment & Techniques => Digital Cameras & Shooting Techniques => Topic started by: ligero on May 29, 2008, 06:25:45 pm

Title: Corrupted Digital Files
Post by: ligero on May 29, 2008, 06:25:45 pm

Canon has twice "repaired" my 5D for "corrupted files". They have replaced the printed circuit board as well as the USB port. So far I've spent $370 with them and still have the problem. Obviously neither repair solved the problem, so I'm looking for reccomendations.

I have attached a typical "corrupted file". This defect does not show itself until the image is processed thru a Raw converter (I've used three: Adobe, DXO & Canon's Pro). The frequency is about 5% (1 image in 20).

Have you ever seen this before?
Any reccomendations for repair other than Canon?

Thanks

Title: Corrupted Digital Files
Post by: dalethorn on May 29, 2008, 07:53:15 pm

Have you tried different memory cards?  If you pull the card from the camera and copy files to the computer from the card, have you tried transferring the files from camera to computer instead?  Or the other way around?  When converting from RAW to JPEG, do you do simple conversions or are there additional steps involved?

Title: Corrupted Digital Files
Post by: ligero on May 30, 2008, 11:23:56 am

Some addtl info:

Yes, I have used multiple flash cards; no change in outcome.

I have transferred images to my computer via the USB connection on the camera; as well as removing the flash card and transferring images via a card reader.

The image looks OK on the camera view screen; as well as looking good after transfer to camera when viewed in Canon EOS software. The "corruption" does not show up until "raw conversion". When converting from Raw I do take full advantage of the options available, not just a simple conversion. I convert the "raw conversion" into either a TIFF or Photoshop file.

Thanks again

Title: Corrupted Digital Files
Post by: dalethorn on May 30, 2008, 02:17:33 pm

The image you posted does look like classic JPEG corruption, but since the problem doesn't show until RAW processing, that would seem to make it a software interpretation issue, not a hardware repair issue.  If it were me, I'd do a couple of things - one is try other process-of-elimination experiments, such as changing the batch process conversion mode, or converting one at a time, etc.  The other thing I would do is get with any local camera/photo clubs and find other users who are doing similar processing.  There are a lot of Canon DSLR users in those clubs.