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[filmscanners] Re: large scanning project
On 31/05/2006 Laurie Solomon wrote:
> What Ed did (and I
> read Tony to be referring to) was to be able to bypass the use of
> twain
> drivers by placing calls to the ASPI layer when contacting the native
> device driver and having his software speak to and with the device
> from
> within his software.
I'm way beyond what I know here, and merely guessing. But I have installed
scanners and used Vuescan without installing mfr. software/drivers. Which,
if what you say is correct, I guess must mean XP has native driver support
for those scanners. That VS has used without me knowing about it.
I still don't see really what it needs drivers for. Issuing appropriate
SCSI (or other) commands is built in to VS. Receipt and response to SCSI
commands is in the scanner firmware. It streams back the image data,
padded with SCSI commands which VS understands. So if the driver is needed
for anything it seems it would have to be for the task of assembling the
data stream into a bitmap image. Maybe VS does use a driver for that, but
maybe not - it handles digicam RAW files without any OEM driver. I assumed
it was all part of Ed's code.
Fundamentally, I just don't know.
Tony Sleep
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