[sane-devel] Epson 4870 IR scanning / mystery command

[Steven Tas]

I try to activate IR scanning on my Epson 4870. I believe that the IR
channel is captured in a second scan of the film whereby the scanning
light and scanning head is somewhat differently positioned. I couldn't
find the "how" in the public Epson manuals. The people from Epson
developer were kind - but couldn't help me either.

I found out - by looking at the commands of a non-sane driver - that the
difference between a regular transparency scan and an IR scan is the use
use of an extra command: ESC-# (0x1b 0x23) followed by 32 bytes.
Unfortunately, I can't figure our the structure of this command. Does
anyone knows?

Thanks in advance,
st