Raw images are not converted into 16bit?

[Heiner Lamprecht]

Hi,

when I convert RAW images, they are always saved as 8bit (tif or
png).  Selecting or de-selecting "16 bits color depth" in the
settings does not have any effect.  How can I save the images in
16bit?


    Heiner

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[Gilles Caulier-4]

I suspect a cache management problem in your computer. try to change this setting and restart digiKam just after and try agin to load the image.

In the Color sidebar, under the histogram, you have the color depth indication

Note: this problem is not reproductible on my computer

Gilles

2007/5/5, Heiner Lamprecht <[hidden email] >:

Hi,

when I convert RAW images, they are always saved as 8bit (tif or
png).  Selecting or de-selecting "16 bits color depth" in the
settings does not have any effect.  How can I save the images in
16bit?


    Heiner

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[Heiner Lamprecht]

On Sonntag, 6. Mai 2007, Gilles Caulier wrote:
> I suspect a cache management problem in your computer. try to
> change this setting and restart digiKam just after and try agin
> to load the image.
>
> In the Color sidebar, under the histogram, you have the color
> depth indication

When I open the raw image in image editor, it is displayed as 16bit,
but very very dark.  When I choose "Raw Image Converter", it always
converts to 8bit, regardless what I have configured in the
settings, and how often I have restarted digikam after changing the
settings.


    Heiner

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[Gilles Caulier-4]

2007/5/6, Heiner Lamprecht <[hidden email]>:

On Sonntag, 6. Mai 2007, Gilles Caulier wrote:
> I suspect a cache management problem in your computer. try to
> change this setting and restart digiKam just after and try agin
> to load the image.
>
> In the Color sidebar, under the histogram, you have the color
> depth indication

When I open the raw image in image editor, it is displayed as 16bit,
but very very dark.  When I choose "Raw Image Converter", it always
converts to 8bit, regardless what I have configured in the
settings, and how often I have restarted digikam after changing the
settings.

Ah ok, i understand now...

RAW converter is a kipi-plugin witch only support 8 bits color depth. 16 bits color depth with RAW file require Color management to run properly. In 8 bits an auto-gamma correction is done by dcraw, not in 16 bits (the image is converter in linear mode).

This is why the image is dark in 16 bits mode. You must use a color profile adapted for you camera to import properlly the RAW pictures with dcraw.

Look into Nicolas Vilard blogs entries for more details :

http://linux.vilars.com/dotclear/index.php?2007/01/03/6-color-management-workflow-using-digikam
http://linux.vilars.com/dotclear/index.php?2007/01/08/8-io-files-settings-advanced-options-how-to-get-the-most-out-of-your-pictures

Gilles
 

    Heiner

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