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Re: `-bg Transparent` option isn't ignored when background color is set

From: Jan-Åke Larsson
Subject: Re: `-bg Transparent` option isn't ignored when background color is set in dvi file
Date: Mon, 17 May 2021 18:53:57 +0000
User-agent: Evolution 3.36.4-0ubuntu1


That was intended, yes, the manual should probably have said "The background color given will be ignored if there is a background color \special in the DVI."

"Transparent" doesn't change the background color, it enables the alpha channel.

The actual background color (visible, say, in a reader without the alpha channel) is controlled by the color spec, and overridden by a color \special.

Did you want this to work differently, or was the problem that you were surprised by the behavior?


On mån, 2021-05-17 at 17:41 +0000, Sébastien Miquel wrote:

The manual says that the `-bg` option is ignored if a background color
is set in the DVI, however this doesn't seem to be the case if `-bg
Transparent` is used.

To reproduce, I used a tex file with the following content.
#+BEGIN_SRC latex
\definecolor{bg}{rgb}{0.858, 0.188, 0.478} % magenta

Then compile it using
#+BEGIN_SRC bash
latex -interaction nonstopmode test_latex_bg.tex
dvipng -bg Transparent -o test.png test_latex_bg.dvi

The resulting png is Transparent instead of magenta. If I specify `-bg
Blue` instead, the background is set to magenta, as expected.

Is this behaviour intended ?


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