[sane-devel] fi-5900 caching options

[m. allan noah]

I assume you are talking about a fujitsu (you never said)? The
'buffermode' option was added to fujitsu backend version 1.0.40 on
2006-08-26, try upgrading SANE to get that.

1. If you power cycle the scanner, and connect only to sane, does it
send BGR data?

2. if you connect to windows and back to sane, it now sends RRGGBB?

allan

On 2/15/08, Viktor Ivanov <v.shrike at gmail.com> wrote:
> I am working with a fi-5900C scanner and have noticed that the windows
> driver has an option for caching. Some of the possible values are None, Use
> Scanner Memory, Use RAM, Use Both. Using the scanner's memory for caching
> makes scanning very fast and I'd like to be able to do that from Linux.
> However, no options pertaining to the caching mode are available from
> scanimage.
>
> I also noticed the following: If the scanner is used from windows with the
> use scanner mem caching option and the PC is then rebooted into linux the
> setting seems to persist and the scanner is blazingly although the scanimage
> parameters are exactly the same. However, the images produced are wrong. I
> diagnosed this to be a color planes interlacing issue - planar data was
> being interpreted as interlaced. I changed s->color_interlace for this model
> to COLOR_INTERLACE_RRGGBB and tested it out. Sure enough the images produces
> were of the same quality as with the "slow" scanimage.
>
> The above observations led me to believe that the fi-5900 has a number of
> options that the user cant set from scanimage. The caching would be very
> useful since it gives about a 50% speedup.
>
> I welcome any pointers as to how I might set the caching option in the
> backend and ultimately with a scanimage parameter.
>
> --
> Viktor R. Ivanov <v.shrike at gmail.com>
>
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