[OS X TeX] MacTeX inputs

[Louis S VanSlyck]

One can use pen color by:

\input color
{\color{red} This line is red.}

Or one can insert a picture by:

\input graphicx
\includegraphics[scale=0.5]{Logo}

But the two inputs seem to be mutually exclusive.
Whichever \input command appears first causes an error at the second, 
and typeset fails.

What don't I know? (Of course that list is unbounded, so please limit 
comments to the particular question.)

I'm using plainTeX in TeXShop, on a G4 with OS X 10.3.9.

Lou

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