[sane-devel] Scanner-based compression for Fujitsu FI-5900c on 1.0.27?

m. allan noah kitno455 at gmail.com
Tue May 15 12:02:28 BST 2018


Commenting out that line is correct, given that later code uses ifdef.
I don't think you will need any other changes.

Please show us the output of scanimage --help, and your scanning
command, and any errors it produces.

allan

On Mon, May 14, 2018 at 7:08 PM, Wes Rishel <wrishel at gmail.com> wrote:
> The 5900 has a mode where JPEG compression is done in the Fujitsu scanner
> backend, thus reducing the bandwidth used in the USB2.0 connection to the
> Ubuntu system.
>
> I have seen this working on an Ubuntu 12-based computer. I understand that
> fujitsu.c from SANE 1.0.24 was modified by the programmer who was
> volunteering for this non-profit back then, but I am not sure that I have an
> exact copy of that C file.
>
> I am trying to get the system working on a new computer with Ubuntu 16.04.
> We have modified the fujitsu.c file but we are getting an error message. I
> don't have the exact message but it was to the effect that an option was not
> enabled.
>
> As such I am hoping to get help with these questions:
>
> - Is it true that the only changes necessary to enable the in-scanner JPEG
> compression are in fujitsu.c?
>
> - Can someone tell me exactly what those changes are for 1.0.27? Just to
> confirm, I think this is build 133.
>
> I have been assuming that this was what required, but perhaps there is
> something more?
>
> At line 667 change:
>
> #ifndef SANE_FRAME_JPEG
> #define SANE_FRAME_JPEG 0x0B
> #define SANE_JPEG_DISABLED 1
> #endif
>
> To:
>
> #ifndef SANE_FRAME_JPEG
> #define SANE_FRAME_JPEG 0x0B
> /*#define SANE_JPEG_DISABLED 1*/
> #endif
>
>
> - At runtime the option being used is in the scanimage arguments is
>
>        --compression JPEG
>
>    Is any other option needed to enable scanner-side JPEG compression?
>
> - Is the --mode color option required for scanner-side JPEG compression on
> this scanner?
>
>
> Thanks in advance.
>
> Regards,
>
> Wes Rishel
> Retired Healthcare Computer Nerd
>
> ____
>
> "Rainbows are just to look at, not to really understand."
>
> Children's Beguiling Ideas About Science        Proffered by T. K. Cassidy -
> Children's Librarian        tkc at kuentos.guam.net
> ____
>
>
>
>
>
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