> \usepackage[pdftex]{color}
This switches to pdf mode if you are using a pdf*tex engine, because
the pdftex option invokes pdftex.def which sets \pdfoutput=1.
The solution is to load the color package without specifying a
driver. teTeX comes with a clever color.cfg, so the color package with
automatically load the right driver.
Since pdftex misses a color stack, you might see some bad suprises by
using color.sty with pdftex. Heiko Oberdiek has written the pdfcolmk
package to get around most limitations. So, I suggest to use
\usepackage{color}
\usepackage{pdfcolmk}
If you want to avoid a warning by using pdfcolmk in dvi mode just use
\usepackage{ifpdf}
\usepackage{color}
\ifpdf
\usepackage{pdfcolmk}
\fi
Thomas
