Thanks very much Richard! Very interested in the GDK patch - I need to make a patch there too to embed resolution information: <a href="https://bugs.edge.launchpad.net/simple-scan/+bug/484616">https://bugs.edge.launchpad.net/simple-scan/+bug/484616</a> I think I need to do the conversion regardless so the preview is displayed correctly. Thanks for the lcms link. --Robert <div class="gmail_quote">2009/12/21 Richard Hughes <<a href="mailto:hughsient@gmail.com">hughsient@gmail.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">2009/12/20 Robert Ancell <<a href="mailto:robert.ancell@gmail.com">robert.ancell@gmail.com</a>>: <div class="im">> 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? </div>Well, first you need to ask gnome-color-manager for a list of suitable profiles using the DBus interface: <a href="http://git.gnome.org/browse/gnome-color-manager/plain/src/org.gnome.ColorManager.xml" target="_blank">http://git.gnome.org/browse/gnome-color-manager/plain/src/org.gnome.ColorManager.xml</a> 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 <a href="https://bugzilla.gnome.org/show_bug.cgi?id=604610" target="_blank">https://bugzilla.gnome.org/show_bug.cgi?id=604610</a> -- 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. </blockquote></div>