[sane-devel] UMax Astra 2200 in 12-bit mode

Alan Corey alancorey at yahoo.com
Mon Dec 5 16:52:15 UTC 2005


I've seen this in 0.97 and 0.98.  There's the option of scanning in 12-bit mode
instead of 8-bit, but it doesn't seem to work.

In my understanding of how it should work, if your scanner has 12/36 bit color
instead of 8/24 bit you should be able to use some of that added dynamic range
when scanning by using the level controls.  If the image you're scanning
doesn't have anything in the dark end, say 1/16 of the range, you should be
able to set your dark slider above that and use the upper 15/16 of the 4096
range which would then get mapped into the 0..255 range for output.  There
shouldn't be any gaps in the "enhanced image" histogram because there's still a
surplus.

Anyway, I've put a small capture of what the preview window looks like in
12-bit mode at http://128.119.200.7/astra2200_12bit_preview.jpg  The document
is a black and white one, so the color in this is false.  The actual scanned
image looks about the same.

 Alan

Still using an operating system that gets viruses, costs money, insults your intelligence, and then accuses you of stealing it?  Why?  www.openbsd.org


		
__________________________________________ 
Yahoo! DSL – Something to write home about. 
Just $16.99/mo. or less. 
dsl.yahoo.com 




More information about the sane-devel mailing list