Rick Rosinski wrote:
> What is the difference between 8-bit and 12-bit images?
> I notice that it takes twice as much space for a pnm file under 12-bit vs 8-bit.
>
> When I used Sane 1.00 under SuSE 6.1, I was able to scan (xscanimage) 12-bit
> images and view them in GIMP. But when I tried Sane 1.0.1 with Umax 1.0.1
> back-end (Umax Astra 1220s), I was only able to scan in 8-bit mode. 12-bit
> yielded purple text and green background. 8-bit looks good.
>
> Ultimately, I will be using xscanimage to scan photographs. I have many photos
> stored under 12-bit graphics, which were converted to JPGs, but now I cannot
> scan in 12-bit. I would rather scan in 12-bit just to make sure that the
> photos are the best they can be?
>
> What is the difference, and is there a way to get Sane 1.0.1 to do 12-bit like
> 1.0 did?
>
> I am using Umax Astra 1220s on a Slackware 7.0 system.
>
Hi Rick,
1) xscanimage does not support 12 bpp (16bpp) at all, if you got a good looking
output with it that was luck.
2) if you do not know for what it is good you simply don`t need it. Displays and
graphic programs normally work with 8(24) bpp. A printer is not able to
make visibile all information that are in 8/24) bpp.
Only if you want to do "hard" color correction AFTER scanning it could get relevant.
3) Try xsane if you really think you need it.
Bye
Oliver
-- Homepage: http://www.wolfsburg.de/~rauch sane-umax: http://www.wolfsburg.de/~rauch/sane/sane-umax.html xsane: http://www.wolfsburg.de/~rauch/sane/sane-xsane.html E-Mail: mailto:Oliver.Rauch@Wolfsburg.DE-- Source code, list archive, and docs: http://www.mostang.com/sane/ To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com
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