Archived posting to the Leica Users Group, 2013/10/28

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] M9 gotcha
From: hopsternew at gmail.com (Geoff Hopkinson)
Date: Tue, 29 Oct 2013 12:53:32 +1000
References: <CA+yJO1A9530NKEUJ2hiHw6KzVS6EpPkS+cPE-6KQzLw2AOC9Tw@mail.gmail.com> <CE943FC8.12C68%mark@rabinergroup.com>

Mark, a DNG is a raw format of course. Structurally it is actually a TIFF
with some extra instructions and there have long been different compression
options for that format.
When you import DNG's with Bridge or Lightroom (newer versions) lossless
compression is applied in any case and there is no other option.
That lossless compression is discrete from anything happening in camera
anyway. Also there can be confusion because there are other export as lossy
DNG options offered by Adobe too. Again that is completely separate from
the in-camera processing and that lossless compression on import.

For a concrete example, if you shoot a DNG in the new M (typ240)
in camera you can set compression (which is always lossless)
then Lightroom 5 you can use import as DNG in Lightroom 5 which will apply
further lossless compression on import.

You still have 14 BIT data (with all of the in-camera raw processing
adjustments as always)
Further to that your processing time on import is going to be affected by
your hardware software version and also options such as what quality
previews you want built on import too. DNG's have very small embedded
previews in comparison to other raw formats.


Cheers
Geoff
http://www.pbase.com/hoppyman


On 29 October 2013 06:22, Mark Rabiner <mark at rabinergroup.com> wrote:

> I don't think there should not be any mystery  as to what Lossless means in
> a compression  scheme. It means no loss. Does not mean "very little loss"
> in
> anyone's book.
> " Lossless data compression is a class of data compression algorithms that
> allows the original data to be perfectly reconstructed from the compressed
> data".
>
> I took my settings off lossless compression six months ago and found my pix
> popped up much less reluctantly in Adobe Bridge as I'm looking at all my
> images. I have a 2t hard disk now up from a 1t so I'm not worried about
> file
> size.
> I also feel that way down the line if there are any issues with working
> with
> images in archaic formats it would be the compression schemes which would
> be
> the thing which does you in. Not that fact that its a straight NEF or RAW
> or
> DNG .
> --
> Mark William Rabiner
> Photographer
> http://gallery.leica-users.org/v/lugalrabs/
>
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


In reply to: Message from images at comporium.net (Tina Manley) ([Leica] M9 gotcha)
Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] M9 gotcha)