# [OS X TeX] dvipng color trouble

"mitcho (Michael 芳貴 Erlewine)" mitcho at mitcho.com
Wed May 23 01:07:25 EDT 2007

```Hi all,

I've recently run into what I believe is a rare bug in dvipng: here's
the setup. (To play along, you can get my test files: http://mitcho.com/discolor.zip
.) I am using MacTeX... in fact, it's today's release.

The LaTeX source file (discolored.tex) loads just two packages: color
and graphicx. The body does two things: an \includegraphics with a
local PNG file (with the bb option to specify the BoundingBox
explicitly) and a \textcolor command introducing some green text,
using the green defined there.

pdflatex produces the expected result: the figure and the green text.
But when you run the following commands...

latex discolored.tex
dvipng -D 200 discolored.tex

you get a PNG (discolored1.png) which shows the text in a brownish
color... the green is gone!!

There are two quick ways to fix this that I've found: one is to not
include the image... if you comment the \includegraphics command out,
the color comes out fine. The second is to not specify a -D (output
resolution) parameter in the dvipng... this also gives you the
expected output. However, in my current project, neither of these are
available options...

I am frankly not very familiar with the inner workings of dvipng...
does anyone have any thoughts? Can this bug be reproduced?

Any hints or suggestions are welcome!

mitcho

--
mitcho (Michael 芳貴 Erlewine)
University of Chicago, Departments of Linguistics and Mathematics
mitcho at mitcho.com