On Thu, Jan 18, 2001 at 03:54:31PM -0500, email@example.com wrote:
> * I think I found 3 sets of data that looks like gamma. Does it make
> sense ?
Yes, that may be ok for color mode. Most scanners I use have 4096
bytes of gamma (per color) so they use a mapping of 4096->256.
> * The scanner is said to be 30 (or 32 ?) bit but I only get 24bit data
> is it supposed to be so ?
That's probably marketing speech. The 30 (or 36, 48) bits are used
internally. After calibration + gamma correction 24 bits are returned
to the computer. Some scanners allow to transmit the raw data with the
higher bits/pixel but then calibration/gamma isn't used (at least in
> * there are also some registers that drive the motor - I can use them
> but if there are some general ideas about how they should work I'll
> be happy to listen
That's quite dependent on the chip the scanner uses. Maybe it helps to
look at a paper about stepper motors.
> * I don't understand how sensor is switched from 75dpi mode to higher
> dpi mode. (i.e. I can drive the carriage at different resolutions,
> but I don't know how to get the sensor to output higher precision
As far as I see at the Mustek scanners the sensor always scans at the
maximum resolution. Only the data is reduced somewhere in the scanner
when lower resolutions are used.
Can I add an entry in the PROJECTS file of SANE for you? So no work is
Is the chip(set) used by canon produced by them or from another vendor?
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This archive was generated by hypermail 2b29 : Thu Jan 18 2001 - 14:09:43 PST