[sane-devel] Weirdness with Canon FS2720U
gmurray at cloudnet.com
Thu Aug 3 09:54:24 UTC 2006
Quoting Tabor Kelly <tkelly-sane-devel at taborandtashell.net>:
> What I would love for someone to take a look at is URB 289-300 in this
> It looks like the windows driver writes 24kB of data to the scanner.
> But look at the data, it isn't firmware, it is a pretty pattern. Any
> idea? Was the developer who wrote this driver just having a little fun
> at my expense?
I took a quick look at the urbs, and have seen similar transfers. I do not
be an expert in that area yet, as I have not reached coding phase for the
that I have been involved with. This may not be a firmware upload. For the
time I have been thinking that there are tables that are uploaded into a
for the purpose of gamma correction, and for shading tables at the point of
of the data. Some scanners obtain 48bits of data, but send only a smaller
bits/pixel, such as 42, or 36. A table could then alter the colors sent back.
Uwe posted some code like those urbs about July 5, 2006.
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