pixels_per_line and bytes_per_line

Hi!

The SANE Standard Version 1.04 under 4.3.8 states that

c >= B * n * d/8    for d > 1

"Note that the number of bytes per line can be larger
than the minimum
value imposed by the right side of this equation.  A
frontend must be
able to properly cope with such "padded" image
formats."

If I undersand it correctly, it means:
For these parameters
	B = 1 [channel]
	n = 100 [pixels per line]
	d = 8 [bits per sample]
	c >= 100 [bytes]
a backend is allowed to set bytes_per_line (c) to a value
more than or equal 
100. For my scanner (Canon PIXMA MP150) a valid width in
grayscale mode must 
be multiple of 12. I set n = 100 and c = 108 so that the
backend by itself 
doesn't need to throw the padding bytes away. But the
output image from 
"scanimage" is corrupted. It seems to me that
the frontend works properly if 
and only if c = B*n*d/8. What should I do in this case?

Regards
-- 
Wittawat Yamwong
Hannover, Germany

-- 
sane-devel mailing list: sane-devellists.alioth.debian.org
http://lists.alioth.debian.org/mailman/listinfo/sane-d
evel
Unsubscribe: Send mail with subject "unsubscribe
your_password"
             to sane-devel-requestlists.alioth.debian.org

pixels_per_line and bytes_per_line

Thread: pixels_per_line and bytes_per_line