[sane-devel] Canon LiDE 90

[sane at tsleg.com]

Hi,

I've made some progress ...

I changed :
 /* CANOLIDE35 */
  {1200,
/*TODO: find a good reason for keeping all three following variables*/
   87,                /*(black) */
   87,                /* (dummy) */
   0,                /* (startxoffset) */
   10400,            /*sensor_pixels */
   210,
   200,

By :
 /* CANOLIDE35 */
  {600,
/*TODO: find a good reason for keeping all three following variables*/
   87,                /*(black) */
   87,                /* (dummy) */
   0,                /* (startxoffset) */
   10400,            /*sensor_pixels */
   210,
   200,

And used the gpo values :
  /* CANONLIDE35 */
  {
   {0x38, 0x80}
   ,
    {0x7f, 0xe0}

It's no so bad ... (but image is always inverted ...)
To have the white led, in color mode of scanimage, it's ok.

scanimage -d  --mode Color > image.pnm

PS : I need to be root ... do you know what to do to avoid it ?

Concerning scan borders, we must change scan area (not best, but better) :
 SANE_FIX (9.),        /* Start of scan area in mm  (x) */
  SANE_FIX (7.7),        /* Start of scan area in mm (y) */
  SANE_FIX (218.0),        /* Size of scan area in mm (x) */
  SANE_FIX (297.0),        /* Size of scan area in mm (y) */




Guillaume Gastebois a écrit :
> Hello,
>
> I modified registers 10-1d with :
>
> {0x04, 0xd3, 0x04, 0xd3, 0x02, 0xa3, 0x20, 0x06, 0x00, 0xff, 0x24, 0x00, 
> 0x00, 0x04},
>   
Where do I set this ? (which parameter of which struct ?)

Thanks again for your help.


PS : Reading your comments, I guess you're french ;)
Bonne soirée ;)

> and now the led is really white (red green and blue by moving eyes).
>
> Led calibration seems to be good.
>
> But calibration is always 60s long.....
> I need help.
> Thanks
>
> Regards
> Guillaume
>
> Pierre Willenbrock a écrit :
>   
>> Hi Guillaume,
>>
>> Guillaume Gastebois schrieb:
>>     
>>> Hello,
>>>
>>> Why calibration is so long (~50/60s) ?
>>>       
>> It is probably failing. Should take about 3-5 seconds. Look at the logs,
>> the calculated averages and calibration are dumped there.
>>
>>     
>>> What are /* Start of white strip in mm (y) */ and /* Start of black mark 
>>> in mm (x) */ in genesys_devices.c ?
>>>       
>> Those are configuration values for calibration steps. I don't know if
>> any of these are currently used or if the values are hardcoded.
>>
>> I think the start-of-black-mark is used to detect the beginning of the
>> document area for some gl646 scanners. The start-of-white-strip was once
>> used in shading calibration. Currently, the shading calibration is setup
>> for a calibration area looking like this:
>>
>> home position
>> +--------------------------------
>> !   black area
>> +--------------------------------
>> !   white area
>> +--------------------------------
>>
>> The border between black area and white area is autodetected per pixel,
>> as the border is usually not straight.
>>
>> You scanner seems to offer only a white area, so we will need to do
>> shading calibration differently. My current idea is this:
>> * always gather data on a white area
>> * for black data, reduce the led exposure time to the minimum(0x101,
>> those registers cannot be set to 0. per byte.).
>> * for white data, use the normal exposure times
>> I tried something like this for offset calibration, to see if there is
>> any difference between white area+0x101 exposure time and black
>> area+normal exposure time. There was no difference in the final images,
>> and i think the resulting calibration was the same as well.
>>
>>     
>>> Regarding the log file you said :
>>> W  ! 0x23 ! 0x050 ! dac value rgb(offset value)
>>> W  ! 0x2b ! 0x028 ! pga gain rgb
>>> But on debug, I see that these two registers are never written.
>>>       
>> 0x23 and 0x2b are merely convenience registers. Writing to 0x23 and 0x2b
>> is equivalent to a write to each of 0x20-0x22 and 0x28-0x2a. For
>> cis-sensors, there is only one channel used, so we could get away with
>> only two registers writes(for the correct channel or 0x23/0x2b), but
>> this won't work for ccd-sensors.
>>
>>     
>>> Another thing : when scaning in color the leds are blue ????
>>>       
>> I'd expect a shade of white, perhaps blueish. my scanner does a
>> magentaish white. You may also see the single colors when quickly moving
>> your eyes relatively to the scanner.
>>
>> Regards,
>>   Pierre
>>
>>
>>     
>
>