Also, from David Suffield's output of 'scanimage -h' above:
--compression None|JPEG [JPEG]
Selects the scanner compression method for faster scans, possibly at
the expense of image quality.
When I do the same command I only get
--compression JPEG [JPEG]
i.e. I don't get the 'None' option. So it seems uncompressed scans are
not supported for my scanner (HP Photosmart 6510). I find this quite
outrageous, that some devloper has taken the liberty to decide that I
don't need uncompressed scans! Especially since there is AFAIK no
alternative to Sane.
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Packages, which is subscribed to hplip in Ubuntu.
https://bugs.launchpad.net/bugs/192176
Title:
Scanner output always JPEG compressed
Status in HP Linux Imaging and Printing:
Invalid
Status in Simple Scan:
Fix Released
Status in “hplip” package in Ubuntu:
Invalid
Status in “simple-scan” package in Ubuntu:
Fix Released
Status in “hplip” package in Debian:
Confirmed
Bug description:
Binary package hint: hplip
The hpaio backend compresses the scanned image with JPEG before it is
received by xsane. This makes it impossible to scan anything
losslessly. Editing ~/.sane/xsane/($scanner).drc to say
"compression"
"none"
Fixes this temporarily.
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https://bugs.launchpad.net/hplip/+bug/192176/+subscriptions
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