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When including images in XeTeX using \XeTeXpicfile I noticed that the dimensions of the output picture are wrong. I created the following MWE:

\nopagenumbers
% The TeXbook, p. 311
\def\hidehrule#1#2{\kern-#1%
  \hrule height#1 depth#2 \kern-#2 }
\def\hidevrule#1#2{\kern-#1{\dimen0=#1
    \advance\dimen0 by#2\vrule width\dimen0}\kern-#2 }
\def\makeblankbox#1#2{\hbox{\lower\dp0\vbox{\hidehrule{#1}{#2}%
    \kern-#1 % overlap the rules at the corners
    \hbox to \wd0{\hidevrule{#1}{#2}%
      \raise\ht0\vbox to #1{}% set the vrule height
      \lower\dp0\vtop to #1{}% set the vrule depth
      \hfil\hidevrule{#2}{#1}}%
    \kern-#1\hidehrule{#2}{#1}}}}

\def\pic#1{\setbox0=\vbox{\XeTeXpicfile #1 width 8cm}
  \vbox{\leavevmode\copy0\kern-\wd0\makeblankbox{.25pt}{.25pt}}}

\pic{test-cmyk300.jpg}
\bigskip
\pic{test-cmyk72.jpg}
\bigskip
\pic{test-rgb300.jpg}
\bye

Please download test-cmyk300.jpg, test-cmyk72.jpg and test-rgb300.jpg and watch the XeTeX output. (Side note: this is a detail of The Haywain Triptych.)

You'll notice that the 300 DPI CMYK image is enlarged, even though the parameter width 8cm is given. A workaround is to set the image resolution to 72 DPI, in which case the size is exactly right. Using a lower DPI setting the image is also scaled down. This problem doesn't exist with RGB images.

Is this a bug in XeTeX?

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  • I suspect a bug in xdvipdfmx rather than XeTeX: I do see the erroneous behaviour here.
    – Joseph Wright
    Feb 6, 2015 at 19:33

2 Answers 2

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It was a bug in XeTeX and was fixed. See http://tug.org/pipermail/xetex/2015-February/025727.html

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On further investigation, it turned out to be a bug in xdvipdfmx and is fixed, thanks to Akira Kakuto.

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