I figured out what is going on here.
My scanner has these settings:
Geometry:
-l 0..215.872mm (in steps of 0.0211639) [0]
Top-left x position of scan area.
-t 0..279.364mm (in steps of 0.0211639) [0]
Top-left y position of scan area.
-x 0..215.872mm (in steps of 0.0211639) [215.872]
Width of scan-area.
-y 0..279.364mm (in steps of 0.0211639) [279.364]
Height of scan-area.
--pagewidth 0..221.121mm (in steps of 0.0211639) [215.872]
Must be set properly to align scanning window
--pageheight 0..863.489mm (in steps of 0.0211639) [279.364]
Must be set properly to eject pages
the padwidth and pageheight give the physical size of the expected paper. -x
and -y are constrained within the pagewidth and pageheight values. This
scanner is sheetfed, so there is no concept of a physical scan bed that has
a limited size. The valid range of -x and -y depend on --pagewidth
and --pageheight. gscan2pdf seems to only be using -x and -y.
If --pagewidth and --pageheight are listed and a paper size large than the
default is selected, the relevant --pagewidth or --pageheight should be
increased to match -x or -y. --pagewidth or --pageheight should never be
decreased. Alternatively, you could always set --pagewidth or --pageheight
to the maximum. As far as I can tell, that works.
-- John
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