[sane-devel] Bypassing calibration in LiDE 110
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
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:
> I've found this old message about bypassing calibration in LiDE 60
> 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
> 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.
> 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
> 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.
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the sane-devel