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07-05-2009, 02:56 AM   #1
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DNG vs PEF?

It seems to me that the only real issue between these two is file size. i rarely do a single day's shoot oh more that say 1600 exposures. If you need to do more shooting in PEF (lossless compression) will allow about 20-30% more depending on content.
The main issue may be HDD space. I have only 2TB on board plus one more on desk as backup. However, I do value this space and conserve if I can.
DNG Converter ((5.4 has recently been released for free download. I have made a test of 100 K-20D DNG files Aafter conversion the new files took up 62.25999% of the space of the originals.
This conversion is LOSSLESS!
Ron McDermott

07-05-2009, 03:09 AM   #2
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Hi Ron,

Is this different from setting your camera to output DNG Raw files? I have always done this, and never used the PEF format at all.
07-05-2009, 03:27 AM   #3
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Try a search on this forum - there are quite a few discussions about the subtle differences between these formats - mostly centred around which software is converting them to JPEG.

I've personally opted with PEF with ACR 4 doing the conversion - is a great combination IMO.
07-05-2009, 06:22 AM   #4
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QuoteOriginally posted by eagle Quote
Hi Ron,

Is this different from setting your camera to output DNG Raw files? I have always done this, and never used the PEF format at all.
It is different in that the camera does not compress the .dng files.

07-05-2009, 07:48 AM   #5
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QuoteOriginally posted by eagle Quote
Is this different from setting your camera to output DNG Raw files? I have always done this, and never used the PEF format at all.
Size. DNG files form the camera are uncompressed and are much larger than the corresponding PEF files; DNG files created by the DNG converter are compressed and are actually smaller than PEF.
07-05-2009, 09:11 AM   #6
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QuoteOriginally posted by Marc Sabatella Quote
Size. DNG files form the camera are uncompressed and are much larger than the corresponding PEF files; DNG files created by the DNG converter are compressed and are actually smaller than PEF.
That's maybe because PEF always embed a full-size one-star preview JPEG. With the DNG conversion this is not mandatory and this can let you save 1-2MB.
07-05-2009, 10:01 AM   #7
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I think I read that the DNGs in the K-7 are compressed now, so I wonder how the file sizes of the DNG and PEFs compare now.
07-05-2009, 12:28 PM   #8
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QuoteOriginally posted by soccerjoe5 Quote
I think I read that the DNGs in the K-7 are compressed now, so I wonder how the file sizes of the DNG and PEFs compare now.
They shouldn't be much different I suppose but for me this is a great new feature because I won't have to convert to compressed DNG during the Lightroom import. The import will thus be much faster and use less CPU power and I won't lose the original RAW (once converted to DNG, Pentax Photo Laboratory or the camera does not recognize it).

07-05-2009, 01:44 PM   #9
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I have been converting my pef files to dng since my *istD days. With a library well over 30,000 images the saved space per file really adds up. I don't like the Pentax software so the loss of compatibility there doesn't bother me. I have also checked with Photoshop and a pef vs a converted dng shows to be mathematically identical as far as the image is concerned.
07-05-2009, 01:52 PM   #10
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DNG + ACR

DNG because I know Adobe will always (hopefully!) keep supporting its own format.
07-05-2009, 10:25 PM   #11
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Hi eagle
In the custom menu (See p 154 of Operating manual) on page 158 under the heading "Setting the File Format" see "Setting the File Format" you will see the dialog box for selecting between PEF and DNG (remember DNG is the open standard file format supported by Adobe). I am corrently using DNG but downloading to the computer using the free "DNG Converted" which has an option for lossless compression.
Eagle, this should work for you.
Regards
Ron McDermott
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07-06-2009, 02:16 PM   #12
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QuoteOriginally posted by Ash Quote
Try a search on this forum - there are quite a few discussions about the subtle differences between these formats - mostly centred around which software is converting them to JPEG.

I've personally opted with PEF with ACR 4 doing the conversion - is a great combination IMO.
I second that. With the codec for Vista, they are even viewable as thumbnails.
07-06-2009, 02:36 PM   #13
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QuoteOriginally posted by GeneV Quote
I second that. With the codec for Vista, they are even viewable as thumbnails.
They are not viewable as thumbnails in XP or Vista 64 Explorer. The codec does allow them to be used in WIC compatible imaging software
07-06-2009, 03:02 PM   #14
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What? No thumbnails. That's tough to work with...
07-06-2009, 05:20 PM   #15
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QuoteOriginally posted by Ash Quote
What? No thumbnails. That's tough to work with...
Nope, no thumbnails. DNG has the same issue unless you buy the third party codec from ardfry.
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