[sane-devel] maximum image size for a scan for Canon pixma backend

Gerard Klaver gerard.klaver at xs4all.nl
Thu Dec 30 17:19:00 UTC 2010

On Fri, 2010-12-31 at 01:29 +0900, Gernot Hassenpflug wrote: 
> Dear all,
> I have been involved in trying to support the Canoscan 9000F, and the
> testing community has grown to about 15 individuals. A few of them
> have programming knowledge and tonight one individual send in
> corrected code to handle the final hurdle: correctly aligning the
> sub-images in the 9600dpi TPU mode. So the scanner is now supported
> for all modes.
> However, for large images at both 4800dpi and 9600dpi modes, it seems
> the max size of the image is limited in some way, so that only a
> section of the desired image is delivered. Is this something that can
> be set in the individual driver files (like pixma_mp150.c) or in some
> of the generic pixma driver .c or .h files (which I do not want to
> touch if possible)? I don't see a problem in the linesize or
> dimensions, only in the image_size value seen by [pixma] debugging
> output.
> Best regards,
> Gernot Hassenpflug
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One possible solution (if not yet done), is to check the declaration of
the  image_size parameter, for a 9600 dpi A4 scan (color) size is about
550 000 000 000 bytes. (long long is needed)
Gerard Klaver

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