[sane-devel] xsane-0.87 released

V K list0570@paradise.net.nz
Mon, 15 Jul 2002 16:50:11 +1200

> I already tried to answer your last mail directly to me
> but you should not use unusable from/reply adresses like:
> 	V K <hidden@paradise.net.nz>
> when you like to have an answer.

Sorry I stuffed up the addresses, and I wasn't expecting an answer.

Thanks for the patch, I'll try it out.

> Selecting lineart should alsways remove the contrast abd brightness sliders.
> There is no sense for this, you need a threshold slider!

I agree, on both counts. There isn't a threshold slider though.

> Sorry to say that, but it is a RTFM! (You can do this with xsane).

Then it would be nice if you told me how. The docs are very good, but if
you're referring to

  "Threshold: ... the backend needs to make available a threshold

then man sane-hp doesn't care to say anything about threshold. The
scanner supports grayscale, there is therefore no reason for the
backend to not support threshold setting with lineart. However that's a
moot point, because changing the threshold with the backend requires a
rescan, which, from the user's point of view, is plain useless (because
doing a gray scan and using image software is way faster than poking
thresholds in the dark).

The enhancement setup says under (grayscale->lineart)

  "Changes of the threshold value are visible in the preview window
  without a new preview scan."

this is the only useful alternative. Whether the backend supports a
threshold or not is pretty irrelevant, xsane should scan in grayscale
and display a threshold slider, but I can't see one anywhere.

I just went into Preferences->Setup->Enhancement and selected threshold
option "XSane main window (grayscale->lineart)" and grayscale scanmode
"grayscale" (though lineart etc. doesn't make a difference here). Exit
save options, select Xsane mode "viewer", colour "Lineart", and the
standard options show a slider for brightness and contrast, plus an
auto-threshold button. If you don't believe me I can send a screen
shot. As per your statement above this doesn't make sense - what am I
missing? And where is the threshold slider? (The advanced options
window doesn't have it either, thanks Henning!).

xsane is so good I started to do all other operations without consulting
the manual, except for the threshold with bi-tone scans, which I still
can't figure out.

One other minor point. The setup window has an apply-button, but xsane
is grayed out while the setup window is open. Is there any point in
having that button then?

Thanks Oliver,


Volker Kuhlmann			is possibly list0570 with the domain in header
http://volker.orcon.net.nz/		Please do not CC list postings to me.