[sane-devel] Epson2 TPU and TPU2 and infrared and a patch

[Claus Boje]

With a little trial and study on what vuescan can I have find some improvement 
for the epson2 driver for the epson 4990 (GX-T800) scanner and probably also 
the GT-X900 and maybe other new epson scanners, but I don't have any to test 
with.

To get the scanner scanning in infrared this patch is necessary. 
It is made against the git version of epson2-opt.c from the 12. of December 
2011

root at claus4:/disk5/sane2/patch# diff -cB git/epson2-ops.c mysane/epson2-ops.c 
*** git/epson2-ops.c    2011-12-09 23:29:28.000000000 +0100
--- mysane/epson2-ops.c 2011-12-09 23:28:40.000000000 +0100
***************
*** 890,895 ****
--- 890,898 ----
                if (s->hw->use_extension && s->hw->TPU2)
                        extensionCtrl = 5;
  
+               if (s->val[OPT_MODE].w == MODE_INFRARED)
+                       extensionCtrl = 3;
+ 
                /* ESC e */
                buf[26] = extensionCtrl;
  



...but there is a problem more.

The scanner (4990) has 2 TPU and TPU2 with a different scansize and the scanner 
can only use the TPU (not TPU2) size for infrared scan.

If the TPU2 is used for infrared scan, the image is a black and white image or 
a NACK from the scanner with the FS W d[64] command.

The right solution would bee to have 2 transparent units with the --source 
argument (flatbed | Transparent unit | Transparent unit 8"x10") witch is what 
vuescan has. I have not made any patch for that !!!!!

xsane cannot scan in infrared, it make the scanner crash (need repower to work 
again). I have used tiffscan for the tests, but scanimage should do it too 
(maybe).

Claus Boje
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