[sane-devel] How to enable 48 bit color depth?

Dale Mosby dale at archcape.com
Mon Jun 20 14:27:22 UTC 2011

I have an Epson Perfection V500 scanner. It works fine with xsane
however only scanning at 8 bit color depth. The scanner is capable of 16
bit color depth (48 bit total). I have installed the Avasys drivers as
per all the net wisdom I found.

The scanner is working but the scanning choice shows "full color" and
nothing giving a choice of color depth. I am trying to archive some old
photos and would like to scan at a greater color depth than 8 bits per
channel. (On another subject I would like to find a way to crop tiffs
saved as 16 bits per color. If anyone knows of a Linux tool to do this
an off-list e-mail would be most appreciated.)

I had an older HP Scanjet connected to a previous version of Ubuntu and
with that Xsane gave me a choice of color depth. So I know that there
must be something telling Xsane about scanner capabilities. I have spent
quite a bit of time with Google searches and haven't figured out what
informs xsane of the scanner color depth ability nor how to get this
scanner working at more than 8 bits per color. If it is possible I would
appreciate some suggestions.

The HP scanner was troublesome but I did get a scan at higher color
depth with xsane so I know it is possible. I am currently using this
with Ubuntu 11.04. Thanks.

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