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General photography questions and answers: Discuss CR2 or DNG...This question may have been raised before so forgive me if it has. at the moment i transfer from a ...
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Old 12-05-2009, 13:53   #1 (permalink)
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CR2 or DNG

This question may have been raised before so forgive me if it has.
at the moment i transfer from a card reader into lightroom in which gives me the option of saving to DNG and it also backs up to my extrnal drive .
Now when i check the external drive file i have now two copies, dng named for the set "ie" [day out]. and another folder CR2, with just a file name "ie" import 01 Feb. lightroom always point to the DNG file if i need to find it.

Now the question is, Is it better to save to dvd, the, CR2file or the DNG file, for future editing
What im trying to do is save space in my external drive but also keeping the original photos on disc away from potential, computer or external drive failure
i hope this make sense confusing the hell out of me
any advice guys ,whats your workflow?
thanks
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Old 12-05-2009, 14:15   #2 (permalink)
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Re: CR2 or DNG

You don't need to save to DNG - you just need the original RAW file (CR2) and the edits (either in the Library or as XML sidecars). DNG is basically just another RAW format, so in fact you're duplicating.

Also I'd be wary about relying on DVD backups - optical media can deteriorate over time. With the price of external hard drives nowadays I prefer to use these, and if you want to be ultra-safe you can back-up to two hard drives.

Jut my 2p, and others may have a different take.
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Old 12-05-2009, 18:04   #3 (permalink)
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Re: CR2 or DNG

Me for one am glad the cost of external hdd's have dropped. A 1tb hdd for 80 at pc world (i remember buying my first 80gb one for that price years ago) is much easier than messing around with DVDs as silkstone says.
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Old 12-05-2009, 18:42   #4 (permalink)
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Re: CR2 or DNG

I did use DNG for my Raw files from my EOS 20D as DNG files store the parametric editing data as well (sidecar files could get lost). However, I now have an EOS 5D2 and the Raw files contain a lot of camera information which is used by DPP in the Raw processing. Although I am not using DPP for most processing (so not really taking much advantage of this), it may be that Adobe Raw may read this data at some point so I have gone back to archiving the Cr2 Raw files. With the 20D I could have archived both CR2 and DNG but the files are rather larger for the 5D2 and disk space is being rapidly used.

Incidently, I would not rely on DVD's or CD's for archiving. I am not saying that you should not make any copies on DVD but just do not rely on them being readable in the future. I have two copies of all of my Raw files and edited files on different physical disk as well as the original. I do have some DVD's as well but recently found some (about half) family digital movies unreadable after about 8 years.
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Old 15-05-2009, 12:31   #5 (permalink)
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Re: CR2 or DNG

Dave, damot,silky.. Thanks for your feedback it looks like i am duplicating my files so i have to make a choice on whether i need to keep the DNG or the CR files i not going to save both if not needed .
i don't have any idea on sidecar files well .. ihave an idea but don't fully understand it all yet.
at my age still learning! i'm going back to film ..No not really .
I will still save to dvd and when my external gets full i'll buy another .
So to sum up, no point in saving DNG and CR2 They are both Raw files one is adobe raw and the other is the camera raw.
dvd are seemed as, not reliable after time.
DNG saves more information then CR2 .
i'm getting there slowly i just need to google more... it's like being on you own photograghy course ,brilliant
thanks guys
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Old 15-05-2009, 12:46   #6 (permalink)
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Re: CR2 or DNG

CR2 saves more than DNG! There may be information in the original CR2 for which there is no available field in the DNG format, although whether this matters unless you are using DPP is debatable.

I don't use Lightroom but I believe that you have the option of keeping editing data solely in the LR Library or also generating an XML sidecar file that also contains this data. The advantage of the latter is that you can save the XML along with the CR2 file and archive both. Also you can port the original files to LR on another computer, and retain all the edits.

I really wouldn't bother with DVDs though - hard drives are a better option, and also quicker and cheaper.
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Old 15-05-2009, 16:16   #7 (permalink)
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Re: CR2 or DNG

An intersting point Silkstone. It would be very useful to know whether DNG stores all of the additional data in a Cr2 file and for whih cameras.

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Old 15-05-2009, 16:31   #8 (permalink)
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Re: CR2 or DNG

DNG should store the basic EXIF, but probably not the Canon-specific data such as auto dust removal, Picture Styles and other things that can be used by DPP. A benefit of DNG is if you have an older version of PS/ACR which doesn't recognise RAW files from newer cameras, but otherwise I'd say that the original RAW is the one to keep.
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