[sane-devel] Resolution: range or list?

[m. allan noah]

Most inexpensive scanners only support a few discrete resolutions. I
would not be surprised if the older version of that backend was
scaling the scanner's output to simulate a range. You'd have to ask
the author.

allan

On Wed, Aug 1, 2018 at 8:32 AM, Brian Potkin <claremont102 at gmail.com> wrote:
> I have read
>
> https://alioth-lists.debian.net/pipermail/sane-devel/2016-June/034624.html
>
> and take away from it the idea that the resolution of a device (for
> Epson scanners, at least) is exposed to a backend by the device's
> firmware. Is there any reason why, if the device reports a resolution
> range, a backend might choose to present only a list to the user?
>
> The context is the hpaio backend.
>
> For libsane-hpaio 3.10.6:
>
> root at squeeze:~# scanimage --help -d
> hpaio:/usb/psc_1300_series?serial=HU3AFBQ28Y9F | grep resolution
>     --resolution 75..600dpi [75]
>
> For libsane-hpaio 3.16.11:
>
> brian at stretch:~$ scanimage --help -d
> hpaio:/usb/psc_1300_series?serial=HU3AFBQ28Y9F | grep resolution
>     --resolution 75|100|150|200|300|600dpi [75]
>
> Some general indication of why it might be decided not to inform about
> the scanner's full capability would be useful.
>
> Regards,
>
> Brian.
>
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