[sane-devel] Lineart emulation

[Gerhard Jaeger]

On Saturday 03 December 2005 01:20, René Rebe wrote:
> Hi,
>
> On Friday 02 December 2005 23:08, Oliver Schwartz wrote:
> > On Wednesday 30 November 2005 21:12, Stéphane VOLTZ wrote:
> > > 	since Pierre has added lineart emulation.
> >
> > I'll need to add something similar to the snapscan backend in the long
> > run, since some new scanners don't support lineart mode. It still
> > would be nice to have lineart for OCR etc. on those scanners.
> >
> > Would it be a good idea to have a common library for the conversation
> > from grayscale to lineart? Is it used in any other backend?
>
> Same applies to interpoliation. I have a huge patch in my inbox that
> adds scaling to my avision backend just because some el-cheapo OEM
> scanners do not appear to deliver any resolution - and for the highest
> resolution of 2400 dpi have a memory shortage and thus the author
> implemented amorphic scans @1200x2400 with software scaling to
> 2400x2400 to compensate this.
>
> In the long run some plugin subsystem (think ALSA) to plug scalers
> together would be a big win. Trivially one could implement this by
> adding a backend (simillar to the dll one) with that functionality
> shadowing any other backend.

Well, also the plustek backends do have such scaling/interpoliation
stuff, maybe I'll find some time to make a proposal for such a lib

Gerhard