[Digikam-users] Fujifilm RAW format: Pallid coloursafter converting

[Enrico]

I asked the same, one week ago. I place here both the question and the 
answer:


QUESTION


  Hallo Everybody!

  I'm a "digital photographer", and I would like to ask you a question, that 
still haven't found answers after my researches. I'm not so expert, but 
before asking to you, I checked on the documentation and in Internet, no 
results.

  When I download raw (.CR2) photos from my digital SLR, I used to convert 
them in this way:

  dcraw -T -w *.CR2

  ...and I got "standard" tiff pictures. Then, I installed Digikam, and I 
got similar results using the raw batch converter, leaving the recommended 
settings (use camera white balance, automatic color balance), only changing 
the savefiles to TIFF.

  But what really shocks me is this: as soon as I download the CR2, Digikam 
shows the thumbnail...and the thumbnail of CR2 has better colors than the 
thumbnail of the converted TIFF!!!
  My question is: which parameters are used to generate the thumbnail from 
the CR2? I suppose that dcraw is used.

ANSWER

The thumbnail are generated to extract the jpeg image embeded in RAW file. 
(dcraw -e option)

RAW files are container : raw image data + reduced JPEG image + metadata.

The reduced JPEG image is used to render picture on TV screen very quickly.

Same behaviours when you display the Preview of RAW picture (F3 in Album 
GUI). Of course it completly different when you edit image (F4 in Album 
GUI). In this case the real RAW image data are used.

Gilles Caulier



----- Original Message ----- 
From: "Timo Steuerwald" <timo.steuerwald at gmx.de>
To: "Gerhard Kulzer" <gerhard at kulzer.net>; "digiKam - Digital Photo 
Management for the masses" <digikam-users at kde.org>
Sent: Sunday, November 11, 2007 11:09 PM
Subject: Re: [Digikam-users] Fujifilm RAW format: Pallid coloursafter 
converting


> Hi Gerhard,
>
> Gerhard Kulzer schrieb:
>> Hope this helps a bit
>>
> Definitely, many thanks!
> Nevertheless, new questions are coming up :-)
> 1. May be this is a little off-topic: Where can I get ICC profile files
> for my camera? Only from the manufacturer?
>
> 2. Where can I get the information with which parameters the thumbnail
> of the raw file has been generated?
> - This looks as I wanted, even if it hasn't been generated using ICC
> profiles. Also the raw file itself will be displayed right if I click on
> the thumbnail, so here must be conversion in almost the same manner.
>
> Cheers
> Timo
>
>
>
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