[sane-devel] Bypassing calibration in LiDE 110

Stef stef.dev at free.fr
Thu Jul 26 10:51:26 UTC 2012

On 07/26/2012 12:38 PM, Anton Marrast wrote:
> Oh, thank you for the info, Stef.
> But when you say about lamp off option, you mean "*--lamp-off-time 
> number*"? I thought this switches off the lamp when the scanner is not 
> scanning.

     I meant the   --lamp-off-scan which is available in the most recent 
git sources (the upcoming 1.0.23).

> 2012/7/26 Stef <stef.dev at free.fr <mailto:stef.dev at free.fr>>
>     On 07/22/2012 06:42 PM, Anton Marrast wrote:
>         Hi,
>         I've found this old message about bypassing calibration in LiDE 60
>         http://lists.alioth.debian.org/pipermail/sane-devel/2008-December/023403.html
>         I've tried to change genesys sourcecode but it's really
>         different now comparing to 2008 version.
>         The thing is that i need to make my scanner work with
>         scannerlamp off (with the lens tray and transparent plastic
>         light transmitter are removed). Where should i alter genesys
>         sourcecodes?
>         It's actually worked pretty fine with modified LiDE 110 using
>         scanimage but last three days, all the scans become messed up
>         with extremely colouful stripes (in color mode, and grey ones
>         in grayscale). I've changed the scanning sensor of the scanner
>         (from another LiDE 110) and then compared the scans – the
>         stripes were totally identical, so it isn't the sensor.
>     Hello,
>     bypassing calibration isn't a good idea, all the pixels in a
>     sensor don't give the same value given the same scanned color. So
>     you have scan a well known target (usually white), and compute
>     correction coefficients for each pixel based on the scanned
>     values. These are sent to the genesys chip so you get good scanned
>     data.
>     Since it was asked frequently, I have added an option to turn lamp
>     off during scan, look at the man page. Calibration is still done
>     with lamp on. Maybe it could help.
>     If you really don't want calibration, just add the
>     GENESYS_FLAG_NO_CALIBRATION flag to your device in
>     genesys_devices.c and recompile.
>     Regards,
>     Stef

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