color profile input: a question

[F.J.Cruz]

El Viernes, 1 de Septiembre de 2006 07:44, Gilles Caulier escribió:

> Le Jeudi 31 Août 2006 23:15, F.J.Cruz a écrit :
> > El Jueves, 31 de Agosto de 2006 23:00, Heiner Lamprecht escribió:
> > > On Thursday 31 August 2006 22:44, F.J.Cruz wrote:
> > > > El Jueves, 31 de Agosto de 2006 22:10, Mathusael escribió:
> > > > > I think that I get almost all my answers in previous post, but
> > > > > "color profile input" are still puzzling me... I am using a
> > > > > Minolta 7D for my shooting and I ask the camera to work/tag in
> > > > > AdobeRGB mode. However their is no way I can convince Digikam
> > > > > to use AdobeRGB as an input mode in the Digikam
> > > > > "Configuration/Configure/ColorManagement" menu. It seems to
> > > > > wait for a camera specific icm profile.
> > > >
> > > > You can't select AdobeRGB profile as input color profile because
> > > > it isn't an input device class profile: it's a display device
> > > > class one.
> > >
> > > But then, why can I configure my camera to save files in AdobeRGB?
> > > If I open such a file, digikam also tells me, that it is AdobeRGB
> > > embedded.
> > >
> > >
> > >
> > >     Heiner
> >
> >  There are 2 options:
> >
> > - Your camera is doing the conversion from and unknown profile to
> > adobeRGB and is embedding this one into the image.
>
> In my Dynax 5D all JPEG file taken using AdobeRGB color space use the .JPE
> file extension.
>
> > - Your camera isn't doing the conversion, but it's embedding such icc
> > profile.
>
> and 3rd possiblilty : the camera use the exif.image.colorspace tag to set
> the right color space use to transform the image : 0 = undefined, 1 = sRGB,
> 2 = AdobeRgb, 0 = undefined, 65535 = uncalibrated. Look here :
>
> http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html
>
> ...and search colorspace tag. digiKam parse this tag value when image is
> loaded in editor and embedded automaticly the right icc color space
> profile.
>
> > In my modest opinnion, if you are working with RAW images, then there is
> > no conversion and the profiles is embedding only.
>
> Some cameras do it, but this is have a non-sence with a RAW file : this one
> must be transformed in a computer after downloading. There is no color
> trnasformation performed by camera.
>
> Gilles

I agree, makes no sense a camera which save raw images with some type of
transform because a raw image is, per se, a 'as-is-taken' image.

Paco.
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[F.J.Cruz]

El Viernes, 1 de Septiembre de 2006 09:43, Nicolas Vilars escribió:

> F.J.Cruz wrote:
> > El Jueves, 31 de Agosto de 2006 22:10, Mathusael escribió:
> >> I think that I get almost all my answers in previous post, but "color
> >> profile input" are still puzzling me... I am using a Minolta 7D for my
> >> shooting and I ask the camera to work/tag in AdobeRGB mode. However
> >> their is no way I can convince Digikam to use AdobeRGB as an input mode
> >> in the Digikam "Configuration/Configure/ColorManagement" menu. It seems
> >> to wait for a camera specific icm profile.
> >
> > You can't select AdobeRGB profile as input color profile because it isn't
> > an input device class profile: it's a display device class one.
>
> Yes this sounds like the normal behaviour.
>
> >> So what I do is I open the raw file, wait for the color management box
> >> to appear, manually select the input to be AdobeRGB... and that's all...
> >> however, I'm not sure I have the good workflow here ;-)
>
> Given what has been said above, I shouldn't be able to do such a thing,
> should I?

As far I know, if you have a jpeg image with an embedded AdobeRGB profile, so
I think this profile has been applied to you picture, you are right: it make
no sense to do a new transform over a transformed image.

Paco.
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[Nicolas Vilars]

Nicolas Vilars wrote:

> Gilles Caulier wrote:
>  
>> Le Jeudi 31 Août 2006 22:10, Mathusael a écrit :
>>  
>>    
>>> Besides I've read from Gilles Caullier in earlier post that you were
>>> using Minolta 5D profile(??). Is this something you build specifically
>>> (shooting a patch of colors and such?)? Something you downloaded from
>>> Minolta? (Where?)
>>>    
>>>      
>> No i'm using Minolta ICC camera profile from DImage Master. Files are here :
>>
>> http://digikam3rdparty.free.fr/ICCPROFILES/CameraProfiles/
> However the ones on the first link looks good, I will try them tonight.

Works great... color are back to normal.
Thanks.
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[Nicolas Vilars]

Gilles Caulier wrote:

> Le Vendredi 1 Septembre 2006 09:32, Nicolas Vilars a écrit :
>  
>> no luck, I'm using a 7D.
>> My lenses are :
>> - Minolta 28-70/2.8
>> - Sigma 100-300/4 EX
>>
>> Still interested though?
>>    
>
> Yes, of course : Minolta makernote from 7D and 5D are around the same. about
> the LensId tag, it's the same.
>
> Look recently the new Sony Alpha 100 use also the Dynax 5D makernote. (normal
> since Sony have buy all Minolta digital camera business)
>
>  
>>> take a picture with a lens and scan the jpeg file taken using Exiv2
>>> command line tool like this:
>>>
>>> exiv2 -pt MINOLTA-DYNAX5D.JPG | grep LensID
>>>
>>> if you have a number instead a string description of the lens, please
>>> give me some details about the lens. I will add this one into Exiv2
>>> library.
>>>      

Ok, all my lenses got some kind of identification.
Sigma 100-300 is reported as AF100-300mm F4.5-5.6(D), 28-70 as AF28-70mm
F2.8G.
However, I have an extra Sigma 17-35mm f/2.8-4.0 (D) EX which is
reported as a  AF24mm F2.8.

Which obviously is not the case.

You need more information on that one?
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[Gilles Caulier-2]

Le Mercredi 6 Septembre 2006 09:19, Nicolas Vilars a écrit :

> Gilles Caulier wrote:
> > Le Vendredi 1 Septembre 2006 09:32, Nicolas Vilars a écrit :
> >> no luck, I'm using a 7D.
> >> My lenses are :
> >> - Minolta 28-70/2.8
> >> - Sigma 100-300/4 EX
> >>
> >> Still interested though?
> >
> > Yes, of course : Minolta makernote from 7D and 5D are around the same.
> > about the LensId tag, it's the same.
> >
> > Look recently the new Sony Alpha 100 use also the Dynax 5D makernote.
> > (normal since Sony have buy all Minolta digital camera business)
> >
> >>> take a picture with a lens and scan the jpeg file taken using Exiv2
> >>> command line tool like this:
> >>>
> >>> exiv2 -pt MINOLTA-DYNAX5D.JPG | grep LensID
> >>>
> >>> if you have a number instead a string description of the lens, please
> >>> give me some details about the lens. I will add this one into Exiv2
> >>> library.
>
> Ok, all my lenses got some kind of identification.
> Sigma 100-300 is reported as AF100-300mm F4.5-5.6(D), 28-70 as AF28-70mm
> F2.8G.

ok. No need to change something here in Exiv2.

> However, I have an extra Sigma 17-35mm f/2.8-4.0 (D) EX which is
> reported as a  AF24mm F2.8.

ok. Exiv2 from svn fixed. Thanks for the report.

Gilles.
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