Color management and Simple Scan

[Robert Ancell]

Thanks very much Richard!

Very interested in the GDK patch - I need to make a patch there too to embed
resolution information:
https://bugs.edge.launchpad.net/simple-scan/+bug/484616

I think I need to do the conversion regardless so the preview is displayed
correctly.  Thanks for the lcms link.

--Robert

2009/12/21 Richard Hughes <hughsient at gmail.com>

> 2009/12/20 Robert Ancell <robert.ancell at gmail.com>:
> > I don't know much about color management so my question is:
> > - What do I need to do to make Simple Scan work with GNOME Color Manager?
> > - Is there a GPL project I can lift some code from?
>
> Well, first you need to ask gnome-color-manager for a list of suitable
> profiles using the DBus interface:
>
> http://git.gnome.org/browse/gnome-color-manager/plain/src/org.gnome.ColorManager.xml
>
> If you know the device you're using (you probably should) then you can
> call GetProfilesForDevice() with the sysfs path, and a list of
> profiles will be returned. If more than one profile is returned you
> probably need to show it in a combo-box or something, but it would be
> quite unusual for more than one profile to be returned. If you get no
> results, then it's probably because the user has never assigned a
> profile for that device (i.e. there is no a-priori mapping). In this
> case you can either default to not doing color conversion yourself, or
> instead call the GetProfilesForType() dbus method, using the
> type=scanner. This will return a list of profiles that are suitable
> for use with scanners.
>
> Now, when you have a filename of the profile you want to use it's an
> easy (!) case of acquiring the image like usual, and then you can
> either:
>
> * Just save the image with an embedded color profile (see bug
> https://bugzilla.gnome.org/show_bug.cgi?id=604610 -- I'm working as
> fast as I can on the infrastructure bits)
> * Convert the image from device-mapping to something like sRGB using
> lcms (there are examples in the lcms tarball)
>
> I think it's probably best you do the first one, unless you know
> you're going to be using the images in a non-color-aware application.
>
> Anyway, I hope that helps,
>
> Richard.
>
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