On 07/09/14 09:02, Paul Newall wrote:
On 07/09/14 01:04, Rob Locher wrote:
I posted to the list because I was having trouble scanning a
black-and-white document with my Kodak 5100 AiO, and on Wed, 03 Sep
2014 10:34:58 -0700, NEWALL Paul <p.newa...@ntlworld.com> wrote back
(I trimmed a bit to save space):
The kodak ESP AiO printers basically only scan in colour, and the gray
option is generated in software from the colour scan. It is possible
that
there is something wrong with the conversion to gray that needs to
be fixed.
We could generate a lineart option in a similar way.
First, can you do a scan of your document using the colour option with
default settings? just to check that the white paper comes out
approximately white and the black ink approximately black. If not
there may
be something else that needs fixing to make the ESP5100 work before
we can
do the conversion to lineart.
Hi Paul, and thank you for your reply. If you're one of those
wonderful people who make useful software available to everyone for
free, then thank you especially for that!
I did as you asked, and scanned the same document in color using the
default settings. The results are somewhat psychedelic:
http://www.idiompress.com/misc/kodak-5100-aio-color-scan.png
The black comes out fairly black, but white isn't white unless it's
near something black. No wonder I wasn't able to get a reasonable
scan despite all my tweaking, if color settings were the problem but
were unavailable to me in "gray" mode.
Regards,
- Rob
Thanks for the colour scan. It seems that I have the same problem,
though much less strongly. I get a slight yellow speckle in the white
areas.
It's caused by a mistake in the colour correction curves, I was
sending 255 points for each colour instead of 256.
I expect to have fixed that in a few days.
Paul
The git version of sane now has this problem fixed. (kodakaio version 2.5.1)
Paul
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