Corruption of RAW files / rendering preview

I have recently imported many RAW files that I took at an event. The problem is that whilst many of the photos look great, approx a third initially look good but then a 'rendering preview' message comes up - once the message has disappeared the photo's change and end up looking awful!!!
Without meaning to sound ungrateful, before anyone gives the standard role-out answer, I am very aware that RAW files do not contain camera settings etc etc and that the image that comes up instantly is a jpeg until it has finished rendering etc etc. The point being that all photos were taken on the same camera, in the same situation, on the same card and dowloaded at the same time.
Why are only some of the shots coming up with the 'rendering preview' message? The majority render instantly and look great!!
Why do they look so bad. The best way I can describe the way they look is:
very little dynamic range
high contrast
too much gamma
blown highlights
very poor quality
cold
Thanks in advance

Hi Guy,
Having the same problem and discussion here:
http://www.dppro.co.uk/forum/viewthread.php?forum_id=14&thread_id=144&pid=841#post_841
I've checked my "edit/Preferences" and on the Pre-sets Tab my auto tone box is not checked. I don't think it's that but it's at least a helpful suggestion.
You ask" Why are only some of the shots coming up with the 'rendering preview' message? The majority render instantly and look great!! "
it will be the amount of cache/virtual memory you have set aside for Lightroom. The previews will be generated up to the cache limit and then only on demand. Click on one of the unaffected previews and I'll wager that goes south too :o(
I think it's a bug. Your comment about expecting people to say RAW files don't have camera settings. I think that's off the mark. My understanding was that RAW files didn't compress any in camera tweaks irreversibly. It makes no sense for new DSLR's to have all these fancy features if the optimum file format chooses to ignore them. Why bother to put them on Pro spec cameras if they can only be used on Jpeg files? i could be wrong but I'm there's just no point in having all the settings in camera if any serious enthusiast/Pro looking to get the best from their investment has to put hours in on the PC because the premium file option ignores their in camera effort. I though RAW was about options and being able to change your mind. Like I say i could be wrong but I think it's a bug.
I had to upgrade to v 1.3 so I could get the software to read my D300's RAW files. I'm sure an earlier version of lightroom used to pull this stunt too but I'm sure my Fuji S3 files were not...abused... in this way by v1.2.
I'll watch this thread with interest. I hope it works out favourably.
Regards David

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When i open my Canon RAW-files with preview or transfer them to another program using preview they change to color despite the fact that they where all shot in B/W... How to change this?

When i open my Canon RAW-files with preview or transfer them to another program using preview they change to color despite the fact that they where all shot in B/W... How to change this?

I shoot only RAW - no JPEG-files except those visualizing the files on my memorycard or computer. I think i have to refine my question;
1. I know there is possible to make B/W HDR-images.
2. I know the best HDR images are based on RAW-files.
3. When i transfer the images in question to a HDR software they change, so when i view them in the software (either Preview or the HDR software) they are suddenly viewed (and processed) in color.
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Corrupt CR2 RAW files

Has anyone found a fix for CR2 RAW files being corrupted? I have read all the thread postings I could google on various forums and can not seem to find any solid fix to the problem.
I purchased the Canon 400D for my trip to Asia and shot over 1500 photos, almost all in RAW. I transferred 90% of the images onto CDR and DVD media to make more room my Sandisk Extreme III 4gb card. Of the 1500+ photos, 150+ of my images remain corrupted.
I am posting this in hope that someone has found a fix.
Hardware:
Canon 400D Xti Rebel
Sandisk Extreme III 4gb
Atech Flash Technology "Pro-Gear" USB 2.0 card reader
IBM/Lenovo Z60M desktop replacement
Software:
Canon's DPP (Digital Photo Professional)
Microsoft Camera Raw Viewer (does not work with CR2)
Adobe CS2 with latest upgrades
I filled my CF card up four times during the duration of my trip.
Listed in order:
1 - 6 CDR's
2 - 1 DVD
3 - 3 CDR's
4 - straight transfer from CF card to my Z60m laptop
Of the four times I DL'ed images, the first 4 CDR's were the only folders that did not carry any corrupted files. All files were DL'ed onto a PC using my Atech card reader locally before burning.
Of all the images I took, I noticed a total of about 2 to 3 images that are shown to be corrupted when played back on my camera. I reviewed each and every file anywhere between 1 to 5 times on my camera prior to transfer and they all looked fine (maybe the camera plays back the embedded jpegs?). I would delete all images using the in camera function. I formatted the card before each fresh shoot. Originally thinking it was a CD/DVD transfer issue, that would not explain why some images from the last batch off the CF card (straight from CF card to reader to laptop) were also corrupted.
Here's my workflow (I'm new to RAW): I used Canon's DPP for a day and all the thumbnails displayed perfectly. Like CS2, I believe the software first displays the embedded jpg Thumbnails before loading the actual RAW preview. I did NOT notice any corrupted images based on the rendered thumbnails but I have not verified all my images first before making a strong claim to this.
I have not installed my copy of CS2 at this point and anxious to use Adobe Bridge, I did so the following day. After playing with some images, I began to notice some weird lost of colors in some of my thumbnail preview images. I attempted to open these files and DPP gave me a corrupt image notification. I tried it in Adobe Bridge and the images opened only to show me that either the image had part of it white, black or various colors. Some images were entirely black.
On the advice of a forum poster, I used Fastone Image viewer to see if I can save the image as jpegs and it worked but the jpeg was a smaller both in file size and dimension; not a complete lost at least. I did not recall having any image corruption with the exception of about 3 images (at most) which was witnessed on the camera itself during playback which prompted me to think that there was a bad sector on the CF card.
Notes:
- One forum poster suggested that Microsoft's RAW viewer were causing problems. Originally, I attempted to open one or two CR2 files and MS RAW viewer launched but gave me errors. I DL'ed the latest version and installed it and it will also not work on CR2's. After reading the MS page on the RAW viewer, it shows that CR2 was not supported yet. I then uninstalled the proggie after reading the posting.
- Another forum poster suggests that it is a bad card reader. I will attempt to transfer images directly from the camera going forward.
I'd hate to have this happen again but can not fathom why the problem will not reiterate itself with more RAW transfers going forward. Hopefully, someone has a good solution. Thanks. -Will

Rita,
The process for determining what is causing the files to be corrupt can be a tedious one depending on the following:
1. Can you review the images on your camera's LCD screen without problems? If not then the problem is most probably either a corrupted/faulty memory card or a faulty camera. If this is the case then your best bet at recovery (of sorts) is to use a program such as BrezzeBrowser from BreezeSys to extract the embedded jpeg versions of the corrupted RAW files from within each RAW file. Chances are, you won't manage to actually repair the corrupted RAW file but the jpegs are better than nothing.
2. If the images review ok on your camera but are corrupted when viewing on your computer and there seems to be no other problem with other files on your computer then it may be either a faulty card reader or usb/firewire cable between the card reader and the computer that is the culprit. Try the card reader with a different cable and also try a different card reader to determine the cause of the corruption.
3. If your symptoms are that you get different files corrupting over time when viewing them on your computer then the problem may be any one of either failing RAM memory, hard disk, hard disk controller or IDE/SATA hard disk cables. This is where the troubleshooting can be pretty tedious testing then eliminating each item from the list of suspicious pieces of hardware. Try the card and card reader on an altogether different computer to see if the files transfer correctly to that computer. If so then the problem lies with your computer hardware. If you haven't already done so at this stage, backup all your important data immediately (hopefully you keep backs anyway).
Hope this helps.

LR corrupting my Raw Files

I've read the other discussions but haven't really seen an answer yet and the typical responses don't seem to apply to my situation. Here is my situation:
I'm am getting corrupted RAW files after importing into LR. Typically this is blamed on Hardware issues but I don't think that is the case for me. I am getting 1 corrupt file per 100 or so imported. I've had it happen using different CF cards. And the file doesn't seem to be corrupt on transfering to my hard drive. I'm using a Canon 40D. Using Lightroom 3.2 64bit. I shoot in RAW. Here is my work flow.
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I then back up the originals before importing into Lightroom by burning them to back up discs.
I then import them into Lightroom from their location.
Upon initial look everything is fine but when you actually select an image and the preview is fully rendered you can see the corrupt image. Usually a white rectangle in the bottom right side the image. Sometimes you get the yellow and pink streaking in that same area as well.
In trying to open the original file from my hard drive using just my basic Canon Digital Photo Proffesional after it was imported into LR it also states that the image is corrupted.
Now if I get out my back up disc and copy that image to my desktop and open it in Canon Digital Photo Proffesional it opens it without problem. There is no corruption. So the file that I backed up from my hardrive shows no corruption. I think the original file is fine.
I then copied the image from my desktop to the original folder on my external hardrive overwriting it. The image in lightroom is now fine. There is no corruption.
Process of elimination leads me to believe that the corruption happens on importing into Lightroom. It isn't my cards (different cards same problem). It isn't my external hardrive as the file copied from that drive is fine. It seems random especially being that I can overwrite the file with the same file and then it is fine.
I really hope this problem is sovled quickly. This to me is a BIG deal. Any other ideas?

Thanks, I'll think I'll go ahead and invest in a new hard drive.
I know about the jpeg preview thing. The corruption doesn't show until you attempt until it renders the image at full size pulling from the raw. I know it isn't a display thing as exporting the raw to a jpeg still shows the corruption. The file is corrupted and attempting to open it with other programs shows the corruption. It seems odd that the corruption doesn't happen when being placed on the hard drive from my camera as my back up shows no corruption. The corruption is happening at a later point. Would an image start out fine on a hard drive and then end up corrupting apart from any program changing it?

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I genuinely tried to explain the reasoning of my mention of the Elements forum, in my second post, by explaining that several Elements users seeking for help arrive here, and we usually redirect them where users with more experience with that product hang out. I did not mean at all to wave you off of this place, as, everybody is welcome to hang out everywhere they want in the forums, share experience/knowledge, like you did in your first post; I just tried to explain why I made the elements forum notice in the first place.
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Now, can we please get back to the problem at hand? If you want, you can contact me by private message, I'd really want to settle this misunderstanding. I'll stop the coffee if you do, ok?
Thanks for the vote of confidence, Noel, Dag, Trevor and Jeff!

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