colour issues with digikam / showfoto

[Matthew Melvin-2]

I'm using digikam to take pictures from my camera (a pentex k100d, I
don't know if that makes a difference) and edit them before up loading
them to facebook.  Mostly just happy snaps for the family to see so
nothing sophisticated.   But, after I've uploaded them to facebook, the
pictures that have been modified by showfoto appear much bluer than they
do on my machine.  If upload them unedited, or edited with something
other than showfoto like gthumb or the gimp, then they appear as
expected.  But with digikam even if I just do a 'save as' of the picture
without changing anything I have the same issue.

My only clue so far is that it must be something to do with ICC colour
spaces (although I don't have colour management enabled in my config).
If I open my edited image in gimp, as it loads the image it says
something about 'converting from sRGB to sRGB built-in' and the loaded
shows the same (or at least, very similar) blue tint I see in my
uploaded images.

I'm sure this is something obvious so I apologise if this is a FAQ but
I'm not sure I understand my problem well enough to research it
properly. :) So far all of I've got my googling is the realisation that
there's way more to digital photos/colours than I imagined.

Any guidance would be much appreciated.

M.

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[Gilles Caulier-4]

Matthew,

1- which digiKam version you use ?
2- which file format you use ?
3- can you send me a sample picture in private ?

Best

Gilles Caulier

2008/6/20 Matthew Melvin <[hidden email]>:

>
> I'm using digikam to take pictures from my camera (a pentex k100d, I
> don't know if that makes a difference) and edit them before up loading
> them to facebook.  Mostly just happy snaps for the family to see so
> nothing sophisticated.   But, after I've uploaded them to facebook, the
> pictures that have been modified by showfoto appear much bluer than they
> do on my machine.  If upload them unedited, or edited with something
> other than showfoto like gthumb or the gimp, then they appear as
> expected.  But with digikam even if I just do a 'save as' of the picture
> without changing anything I have the same issue.
>
> My only clue so far is that it must be something to do with ICC colour
> spaces (although I don't have colour management enabled in my config).
> If I open my edited image in gimp, as it loads the image it says
> something about 'converting from sRGB to sRGB built-in' and the loaded
> shows the same (or at least, very similar) blue tint I see in my
> uploaded images.
>
> I'm sure this is something obvious so I apologise if this is a FAQ but
> I'm not sure I understand my problem well enough to research it
> properly. :) So far all of I've got my googling is the realisation that
> there's way more to digital photos/colours than I imagined.
>
> Any guidance would be much appreciated.
>
> M.
>
> --
> ... with eskimo chain i tattooed my brain all the way...
>
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users
>

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[Matthew Melvin-2]

On Fri, 2008-06-20 at 15:27 +0200, Gilles Caulier wrote:

> Matthew,
>
> 1- which digiKam version you use ?
> 2- which file format you use ?
> 3- can you send me a sample picture in private ?

Hi Gilles,

        thank you for your assistance.  I'm using digiKam 0.9.3.  I'm
using jpg files at each stage.  Attached(*) is the original image as
copied off the camera, the same image created by doing a 'save as', and
also the results of uploading those two images to facebook.  Hopefully
they prove helpful.

M.

P.S.  I'm not entirely clear on the difference between using standalone
showfoto, or the editor within digikam.  I've get the same result either
way.

* Attachments omitted from the list version of this message.

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[Rick Wagner]

On Friday 20 June 2008, Matthew Melvin wrote:

> On Fri, 2008-06-20 at 15:27 +0200, Gilles Caulier wrote:
> > Matthew,
> >
> > 1- which digiKam version you use ?
> > 2- which file format you use ?
> > 3- can you send me a sample picture in private ?
>
> Hi Gilles,
>
>         thank you for your assistance.  I'm using digiKam 0.9.3.  I'm
> using jpg files at each stage.  Attached(*) is the original image as
> copied off the camera, the same image created by doing a 'save as', and
> also the results of uploading those two images to facebook.  Hopefully
> they prove helpful.
>
> M.
>
> P.S.  I'm not entirely clear on the difference between using standalone
> showfoto, or the editor within digikam.  I've get the same result either
> way.
>
> * Attachments omitted from the list version of this message.

Matthew,

What compression (quality) setting do you have set for saving jpegs?  The
quality setting can make a difference. (High compression == lower quality).  
You can find the setting under "Settings->Configure digiKam->Save Images".

        --rick
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[Matthew Melvin-2]

On Fri, 2008-06-20 at 21:22 -0700, Rick Wagner wrote:
>
> What compression (quality) setting do you have set for saving jpegs?
> The
> quality setting can make a difference. (High compression == lower
> quality).  
> You can find the setting under "Settings->Configure digiKam->Save
> Images".

98%.  I chose this to match the setting the camera uses.

[matthewm@alnwick Desktop]$ for i in imgp8984-*; do echo $i; identify
-verbose $i | grep Quality; echo; done
imgp8984-digikam.jpg
  Quality: 98

imgp8984-original.jpg
  Quality: 98

[matthewm@alnwick Desktop]$

 So my input and output files are roughly the same size.

[matthewm@alnwick Desktop]$ ls -l imgp8984-*
-rw------- 1 matthewm matthewm 2156408 2008-06-21 02:34
imgp8984-digikam.jpg
-rwxr-xr-x 1 matthewm matthewm 2163215 2008-06-21 00:29
imgp8984-original.jpg
[matthewm@alnwick Desktop]$

M.

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