Export pixel colors to a file

Hi, all --

I working on a project with some geologists. We want to (1) load digital
photos into AutoCAD (Map 2000); (2) draw a vertical line across the image;
and (3) export the Red/Green/Blue color values of each pixel crossed by the
line to a comma-separated text file.

It seems to me that the computer must "know" somewhere what the pixel color
values are for each screen pixel. Can LISP or VBA or ___(?) access these
color values and export them to some sort of file?

I'm flexible re the format of the export file (comma separated, tab
separated, whatever -- anything I can open, read and translate into what I
need).

Thanks

John

)))))))
(o)-(o)
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John Cutler -- Mapping/GIS Director,
Ozark Regional Land Trust
(Ozark Bioregion - MO/AR/KS/OK)
2435 Sweetwater Lane
Mansfield MO 65704
(417) 741-7363

www.orlt.org