[tex-k] patch to epstopdf

[Karl Berry]

    monochrome images (PS might not be)

I cannot speak to "color models", and Ghostscript options are yet
another world, but PostScript the language certainly supports monochrome
images, in that the venerable image operator handles images with depths
of 1, 2, 4, or 8 bits.

I can't say I know what to make of it in practice,
http://www.ghostscript.com/doc/current/Ps2pdf.htm does list various
Mono* parameters.  William, is that what you were tinkering with?

In any case, I see no reason not to add the grayscale option just
because we haven't figured out the monochrome option.  

Thanks,
Karl