I thought that DNG files were always compressed, but just learned that
DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
compressed with the Adobe DNG converter?
--
On Sun, 15 Jun 2008 14:57:00 +0200, Alfred Molon
<alfred_molon@yahoo.com> wrote:
>I thought that DNG files were always compressed, but just learned that
>DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
>compressed with the Adobe DNG converter?
I wasn't able to compress DNGs from the K20D using DNG Converter.
I found a review site that had DNG and PEF images for the K20D. I ran
both through DNG Converter. The size of the DNG image was unchanged at
12,015KB, and the converted PEF image went from 13,610KB to 12,015KB.
I don't know if Lightroom or the Pentax software can compress
K20D-produced DNG files.
Alfred Molon wrote:
> I thought that DNG files were always compressed, but just learned that
> DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
> compressed with the Adobe DNG converter?
The DNG Converter that I have (Adobe) on WinXP and Mac Leopard has a
non-compressed and a lossless-compressed mode.
In the lossless-compressed mode, DNG's are slightly more compressed than
the OEM raw of Nikon, Canon and Minolta/Sony. (typically: 10 - 15%).
I'm not sure if you can use the general utility (DNG Converter) to take
the Pentax DNG and convert it to DNG with compression. The converter is
available for free from Adobe.
DNG is not primarily (or even secondarily) about compression but about
archiving in a non OEM format. Adobe are now making DNG into an ISO
standard. (Will take years to sort out).
In article <6nka54d8meplb762tun3rqlol20f0t05j1@4ax.com>, TRoss says...
> On Sun, 15 Jun 2008 14:57:00 +0200, Alfred Molon
> <alfred_molon@yahoo.com> wrote:
>
> >I thought that DNG files were always compressed, but just learned that
> >DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
> >compressed with the Adobe DNG converter?
>
> I wasn't able to compress DNGs from the K20D using DNG Converter.
>
> I found a review site that had DNG and PEF images for the K20D. I ran
> both through DNG Converter. The size of the DNG image was unchanged at
> 12,015KB, and the converted PEF image went from 13,610KB to 12,015KB.
>
> I don't know if Lightroom or the Pentax software can compress
> K20D-produced DNG files.
If your K20D DNG is 12015 KB then it is already compressed. Uncompressed
the DNG of the K20D would be about 22-23MB.
--
>I thought that DNG files were always compressed, but just learned that
>DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
>compressed with the Adobe DNG converter?
Yes. I shoot with the K10D and K20D and usually shoot DNG with the
former -- with the latter I shoot PEF (to save card space) and convert
to DNG later.
Whichever format I'm shooting, re-naming the files for my own
archiving system is part of my workflow and DNG converter also
performs this renaming operation.
So basically, my workflow is the same no matter which format I shoot.
YMMV.
"Alan Browne" <alan.browne@Freelunchvideotron.ca> wrote in message
news:_O6dnRnVFMFx-MjVnZ2dnUVZ_tTinZ2d@giganews.com...
> Alfred Molon wrote:
>> I thought that DNG files were always compressed, but just learned that
>> DNGs of the Pentax K20D and Samsung K20D are not compressed. Can they be
>> compressed with the Adobe DNG converter?
>
> The DNG Converter that I have (Adobe) on WinXP and Mac Leopard has a
> non-compressed and a lossless-compressed mode.
>
> In the lossless-compressed mode, DNG's are slightly more compressed than
> the OEM raw of Nikon, Canon and Minolta/Sony. (typically: 10 - 15%).
>
> I'm not sure if you can use the general utility (DNG Converter) to take
> the Pentax DNG and convert it to DNG with compression. The converter is
> available for free from Adobe.
>
> DNG is not primarily (or even secondarily) about compression but about
> archiving in a non OEM format. Adobe are now making DNG into an ISO
> standard. (Will take years to sort out).
DNG is good for what its worth, but its compression isn't too good. So if
you are converting to DNG just for compression and would rather want to
preserve your original raw (and with better compression), you might want to
hang on a little.
I have been working on a compression tool for raw formats which preserves
the original raw file (totally lossless). I released demo tool working on
nikon and fuji formats a few months ago
Sachin Garg wrote:
> "Alan Browne" <alan.browne@Freelunchvideotron.ca> wrote in message
>> DNG is not primarily (or even secondarily) about compression but about
>> archiving in a non OEM format.
>
> DNG is good for what its worth, but its compression isn't too good. So if
What part of
"DNG is not primarily (or even secondarily) about
compression but about archiving in a non OEM
format."
confused you to the point of spamming the newsgroup?
"Alan Browne" <alan.browne@Freelunchvideotron.ca> wrote in message
news:18udnT5fUO9MhMXVnZ2dnUVZ_qTinZ2d@giganews.com ...
> Sachin Garg wrote:
>> "Alan Browne" <alan.browne@Freelunchvideotron.ca> wrote in message
>
>>> DNG is not primarily (or even secondarily) about compression but about
>>> archiving in a non OEM format.
>>
>> DNG is good for what its worth, but its compression isn't too good. So if
>
> What part of
>
> "DNG is not primarily (or even secondarily) about
> compression but about archiving in a non OEM
> format."
>
> confused you
I am not disagreeing with you, just wanted to 'add' that if OPs reason is
just saving space, there is an alternate under construction. As it preserves
the original file, it might work better for some.
> I have been working on a compression tool for raw formats which preserves
> the original raw file (totally lossless). I released demo tool working on
> nikon and fuji formats a few months ago
>
> http://www.sachingarg.com/compression/sgraw
>
> I have it working on almost 'all' raw formats now and plan to release it
> soon :-)
Hello, Sachin:
Will your utility work with Kodak's Raw files (.KDC)?
"John Turco" <jtur@concentric.net> wrote in message
news:485B29FD.7582AC2F@concentric.net...
> Sachin Garg wrote:
>
> <edited for brevity>
>
>> I have been working on a compression tool for raw formats which preserves
>> the original raw file (totally lossless). I released demo tool working on
>> nikon and fuji formats a few months ago
>>
>> http://www.sachingarg.com/compression/sgraw
>>
>> I have it working on almost 'all' raw formats now and plan to release it
>> soon :-)
>
>
> Hello, Sachin:
>
> Will your utility work with Kodak's Raw files (.KDC)?
DNG and compression 
Linear Mode
