Re: HP ScanJet IIc ADF report

Peter Kirchgessner (peter@kirchgessner.net)
Mon, 15 Mar 1999 20:22:27 +0100

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Maybe in reply to: Nick Lamb: "HP ScanJet IIc ADF report"

Nick Lamb wrote:
>
> Well, I've finally got access to an HP scanner, so that my ramblings on
> this list are supported by more than the PNM backend and a desire to learn.
>
> The scanner is an ancient HP ScanJet IIc with an ADF, and it is connected
> to a Pentium 90 with a DPT SCSI card of the same vintage as the scanner.
> The Pentium 90 usually runs Windows 95, but I've installed a Linux 2.2.2
> kernel with 64Kb SG_BIG_BUF and I'm talking to it mostly via saned & net.
>
> Discoveries so far
>
> (1) Although the frontends report a resolution up to 1600 dpi the scanner
> really only offers up to 800 dpi real (optical?) resolution.
>

Hi,

the HP ScanJet IIc has an optical resolution of 400 dpi. All other
values
are interpolated. The scanner can do an interpolation for 12 to 1600
dpi.

> (2) 800 dpi is a lot of bandwidth. The scanner backtracks in all modes
> but B&W if the resolution and scan width exceed certain values.
>
> (3) Even when backtracking, Linux + SANE is faster than Win95. A decent
> high resolution colour scan takes half as long in Linux as Win95.
>
> (4) The network doesn't slow down scanning (perhaps it even speeds it up
> since the hard disk is on the same SCSI controller as the scanner)
>
> (5) Playing with the load next/ eject etc. stuff in xscanimage causes it
> to crash. The remote saned seems fine, so presumably this is a network
> backend or xscanimage bug. I had trouble tracking this down further.
>

How does it crash. Do you get a message before ?

> I also found (and reported) an Xsane memory allocation bug.
>
> Nick.
>
> --
> Source code, list archive, and docs: http://www.mostang.com/sane/
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-- Peter Kirchgessner WWW: http://www.kirchgessner.net e-mail: peter@kirchgessner.net

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Next message: Peter Kirchgessner: "Re: [Fwd: HP ScanJet 5p + Linux 2.2.3 w/ sym53c416 driver]"
Previous message: Craig Ruff: "Re: HP Photosmart R032"
Maybe in reply to: Nick Lamb: "HP ScanJet IIc ADF report"