cr2 to dng conversion errors

I'm using the latest version of Photoshop CS5, lightroom 3 & these programs are identical on my PC & laptop. Using Windows 7 on both.

http://www.photoshopus​er.com …lios/view/galle​ry/1321328

I'm using a Canon 7D, Sandisk extreme 32GB UDMA cf card & a Dell laptop loaded with the same CS5 & Lightroom as on my PC.

I noticed at least 20 images over the course of 3,000 shot recently on a trip that are corrupted (see attached images showing the file after conversion from cr2 to dng on my pc & then the corrupted file converted the same way on my laptop). I discovered that the original cr2 files were not corrupted but sometime during the conversion to dng using my laptop, these corrupted files resulted.

I'm pretty sure this is what was done on the laptop: Import all files as cr2, later batch converting using the "convert photo to dng" under Lightroom's "Library" tab. I can't remember how I did it on my PC, but may have converted to DNG at the time of import.

Thankfully, I figured out the original cr2 files weren't corrupt so I re-imported them into LR on my PC at home & the files coverted perfectly to dng.

Has anyone heard of this problem? It doesn't sound like it's my camera, card or PC. I wonder if it's the laptop or the batch conversion that may have accounted for this.

Each day on the trip, I downloaded the cr2 files to my Epson p3000, my other external backup drive & my laptop. To save time on the trip, one night I had Lightroom convert all the cr2 files to dng on the laptop & external backup drive but not on the Epson which saved me. If I would have converted all to dng on this trip, I wouldn't have been able to recover these files. Not sure what is happening.

I routinely do not have the cr2 file embedded during conversion to dng because the file sizes are so large. I have them delete after successful conversion but obviously some files were not successfully converted.

Another question, how do you recover a cr2 file embeded in a dng?

Thanks.

BUMP!

I am... and this is a tricky one but I think we're all safe.:

I'm importing RAW CR2 from a 550D into LR3. I'm getting a big random multicoloured square appearing on some images in LR3 after the conversion.

At first I thought it was because I was importing to my external 1TB USB drive so then I tried the import from the same folder but to a different local drive and everything seemed fine as it was coming in... and here's the tricky bit... until the full (in my case "Medium") previews had been rendered by LR3 after the import. Then the square appeared in the same place on the same image... even when I went into Loupe view at full screen it was there... This lead me to think that it was the RAW file being corrupted on my card in-camera and it was catching the small JPG preview OK but not the big RAW.

So I thought "$#@&# this!"... and clicked one particular file - that really worked but for this annoying square - to send it into Photoshop CS5 so I could see if the Content Aware Fill could pull of some groovy tricks only to find that once CS5 was open and the file loaded... the annoying glitchy square was gone!!! Like it wasn't even there dude!!

No problem... as you were!... Sweet!!!

I can only conclude that LR3 is doing a dodgy render of the previews (every time on the same file???) and I can't figure out how to have it re-render individual ones again (and while I haven't tried it but I'm thinking while I type) so maybe changing from the DNG preview render scale, in my case medium, to a 1:1 for instance and then back might force a re-render and it might just fix the problem.... maybe.

But in the end it's just the preview so it's only a big problem if there's detail in that spot that you need to tweak specifically. CS5 is a great backup in this case though.

And your Canon is as trusty as ever.

Hope this is the answer you were after.

Gambo