[Digikam-users] Color management with Nikon d40x

[Gary Pajer]

On Sat, Dec 13, 2008 at 11:56 AM,  <junk at lexoncom.com> wrote:
> this explains everything, I thought that those thumnails were small.
> But , i tried to extrat one and it was 903K. Big enough to look very good.
> One more think, I am curious if Nikon software also displays JPEG as
> preview while editing or those are Raw images converted to working color
> space and then updated while editing?
> Now I understand algorithms used by nikon raw converter and digikam may
> differ and the final output will depend on how the users uses the editing
> software editing features.  Initially I though that every software uses
> same raw conversion and the image would only differ depending on how it
> was altered during the editing.  It also looks like that it is better to
> use original raw converters.

If "original" means "from the camera manufacturer", I think it's not
necessarily so.  For example, there are different methods to map the
camera pixels to an image element (demosaicing) and none of the
methods can be said to be correct.  They all have compromises, but
each has its own set of compromises.  For most applications, for most
images, for most people, the differences don't matter at all.  One
thing that has bitten me when trying a new raw converter is that some
of them automatically apply some exposure touch up.  I'd prefer that
they didn't.


>
> thx
>
>> 2008/12/13 "Sveinn í Felli (IMAP)" <sveinki at nett.is>
>>
>>> Following message from Elle Stone via Gerard Kulzer
>>> dated Tue, 13 May 2008 08:23:24 +0200
>>> seems to respond to your questions.
>>> Those thumbnails/lowresJPG's are made in the camera using
>>> closed proprietary algorythms.
>>> Cheers
>>>
>>> Sveinn í Felli
>>
>>
>> the image used to render _quickly_ thumbnails in digiKam is a small jpeg
>> image embeded in RAW and taken by camera during shot. It's not a full
>> image
>> resolution version, it's a reduced one generally used to render preview in
>> TV or camera screen.
>>
>> This JPEG image use all camera algorithms to render properlly color/gamma.
>> It's not the RAW image. In fact it have the same render than if you take a
>> real JPEG image instead a RAW.
>>
>> But you cannot compare RAW image data and JPEG image data : RAW do not
>> have
>> color space, JPEG is always in RGB color space.
>>
>> Gilles Caulier
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>
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