[sane-devel] Scanning experience via SANE on Xerox 7600 (Visioneer 7600 as lsusb says)

[newpson]

Works fine following these steps:
0) Copied .fw firmware file from driver installed in Windows.
1) Added my scanner to */etc/sane.d/gt68xx.conf*:

...
# Autodetect Xerox 7600
usb 0x04a7 0x04a6
override "plustek-opticslim-2400"


For some reason, the scanner is idle for about 20 seconds before each scan,
adjusting the exposure, so I had to hardcode some settings and remove the
automatic adjustment of these parameters.
2) Commented lines 1885-1912
<https://gitlab.com/sane-project/backends/-/blob/master/backend/gt68xx_high.c#L1885>
in
sources (*sane-backends/backend/gt68xx_high.c*).
3) Commented lines 1917-1940
<https://gitlab.com/sane-project/backends/-/blob/master/backend/gt68xx_high.c#L1914>
in the same file.

3) Added this code in the same file starting with line 1914
<https://gitlab.com/sane-project/backends/-/blob/master/backend/gt68xx_high.c#L1914>
:

if (!red_done || !green_done || !blue_done)
{
    DBG (0, "gt68xx_afe_cis_auto: setting AFE reached limit\n");
    DBG (0, "gt68xx_afe_cis_MOD: exposed custom values\n");





*afe->r_offset = 13;    afe->g_offset = 15;    afe->b_offset = 16;
  afe->r_pga = 3;    afe->g_pga = 4;    **afe->b_pga = 5;*
    gt68xx_afe_cis_adjust_gain_offset ("red", &values, r_obuffer,
r_gbuffer, afe, &old_afe);
    gt68xx_afe_cis_adjust_gain_offset ("green", &values, r_obuffer,
r_gbuffer, afe, &old_afe);
    gt68xx_afe_cis_adjust_gain_offset ("blue", &values, r_obuffer,
r_gbuffer, afe, &old_afe);

}

4) Also commented the lines 1946-1952
<https://gitlab.com/sane-project/backends/-/blob/master/backend/gt68xx_high.c#L1946>
(in
the same file, of course) trying to save the settings (as I understand it,
the program cannot do this, so the program adjusts them again every time
¯\_(ツ)_/¯ )
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