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<H1>Xsane-0.55: scan resolution selection (Epson 1200S, CVS Sane)</H1>
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<STRONG>From:</STRONG> John Vickers (<A HREF="mailto:jvickers@dial.pipex.com?Subject=Re:%20Xsane-0.55:%20scan%20resolution%20selection%20(Epson%201200S,%20CVS%20Sane)&In-Reply-To=&lt;38AB25F0.33337B8A@dial.pipex.com&gt;"><EM>jvickers@dial.pipex.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Wed Feb 16 2000 - 14:34:24 PST
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Hello.
<BR>
<P>As the mostang.com seems to be down, I though I'd re-send this directly.
<BR>
<P>Xsane seems to report available scan resolutions inconsistently
<BR>
and sometimes incorrectly. Preview resolutions, however,
<BR>
are displayed correctly. Sorry if I'm missing something here about
<BR>
the Epson backend or about Xsane.
<BR>
<P>Regards,
<BR>
<P>John.
<BR>
<P><P>xsane-0.55, CVS sane of 14/02/2000. Epson 1200S (i.e. SCSI) scanner.
<BR>
<P>The set of resolutions reported by the scanner as supported is:
<BR>
&nbsp;&nbsp;50 60 72 75 80 90 100 120
<BR>
&nbsp;133 144 150 160 175 180 200 216
<BR>
&nbsp;240 266 300 320 350 360 400 480
<BR>
&nbsp;600 720 800 900 1200 1600 1800 2400
<BR>
(all in dpi)
<BR>
<P>Exactly this set of resolutions is presented by xscanimage,
<BR>
and by the *preview* resolution slider in xsane.
<BR>
<P>However, the scan resolution *list* presented by xsane is:
<BR>
&nbsp;&nbsp;75 96! 100 120
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;150 200
<BR>
&nbsp;240 300 400 480
<BR>
&nbsp;600 800 1200 1600 1800 1920! 2000! 2100! 2160! 2400
<BR>
<P>So somehow, several values have got lost, and some spurious extra values
<BR>
have appeared.
<BR>
<P><P>The main scan resolution *slider* allows selection of resolutions
<BR>
from 50 to 2400 dpi, in 1 dpi units. I think that this should
<BR>
behave like the preview slider, with only supported resolutions
<BR>
being selectable. Internally, as Oliver has pointed out before,
<BR>
the current slider code uses the nearest supported resolution to
<BR>
the selected resolution, as can be seen from the reported image size.
<BR>
&nbsp;
<BR>
<P><P>I think the sliders would be more useful if the available resolutions
<BR>
were more evenly spaced on the slider: perhaps they could be exactly
<BR>
evenly spaced, or perhaps the slider could use a logarithmic scale.
<BR>
<P><PRE>
--
Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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