[sane-devel] test backend: 1 bit RGB data for grid pattern

Henning Meier-Geinitz henning@meier-geinitz.de
Wed, 25 Sep 2002 21:05:00 +0200


On Wed, Sep 25, 2002 at 11:16:15AM -0700, David Mosberger-Tang wrote:
>   Oliver> I think that makes sense.  When a backend really does
>   Oliver> support this then it can send it as 8 bit rgb image.
> Do we know for a fact that there are no high-speed devices out there
> that produce, say, dithered 1-bit data?  If not, inflating the storage
> and bandwidth requirements for such devices by a factor of 8 seems
> like a non-trivial issue.

The older Mustek SCSI scanners could send 1 bit per color RGB so there
are devices that can. But I have never seen the benefit. I mean, 2
"colors", black and white are ok. 256 (or more) also. But 8? Ok,
that's like CGA (?).

What to do with these images? I mean, it's RGB so it can't be "lineart
+ some IR stuff".

On the other hand, if we exactly define these modes nobody is hurt
even if they are never used.