> If the nikon coolscan is the only device that uses an IR channel,
> the nicon backend is the right place for the filter and the backend
> will send a SANE_FRAME_RGB to the frontend. In that case we would
> not need a SANE_FRAME_RGBI.
I don't think this reasoning holds. The data itself might be of use
to the front end, even if only the Nikon backend can produce it -- and
if one scanner produces it now, it is not unlikely that others will
produce it in the future. It does not seem prudent for the backend to
discard *any* data unilaterally.
-- David Fox http://hci.ucsd.edu/dsf xoF divaD UCSD HCI Lab baL ICH DSCU
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