Scanning with sane-backends-1.0.21-2.fc12.x86_64 and a SCX-4500W scanner no longer outputs color images. Downgrading to sane-backends-1.0.20-10.fc12.x86_64 fixed the problem.
Both versions were tested with:
scanimage --mode Color --format=tiff > ~/foo.tiff
To get both the newer and older versions working it was still necessary to modify libsane.rules which I described in bug #614948.
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A fix for this is building right now for F-12 through Rawhide.
sane-backends-1.0.21-4.fc13 has been submitted as an update for Fedora 13.
sane-backends-1.0.21-4.fc12 has been submitted as an update for Fedora 12.
sane-backends-1.0.21-4.fc14 has been submitted as an update for Fedora 14.
sane-backends-1.0.21-4.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update sane-backends'. You can provide feedback for this update here: https://admin.fedoraproject.org/updates/sane-backends-1.0.21-4.fc12
sane-backends-1.0.21-4.fc14 has been pushed to the Fedora 14 stable repository. If problems still persist, please make note of it in this bug report.
sane-backends-1.0.21-4.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
sane-backends-1.0.21-4.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.