Turn PDF into grayscale
sundar.personal at gmail.com
Mon Jun 26 23:11:34 BST 2006
> I have some color PDFs I'd like to turn into grayscale, any ideas how ?
> I have tried printing to PDF (the pdf itself) and setting it to grayscale, but
> the PDF ends up in color anyway.
> Thank you.
You can do this quite simply at the command line using the Imagemagick
tools. Install imagemagick ('apt-get install imagemagick' should do the
to convert a file named color.pdf to grayscale and store the output in a
file named gray.pdf:
convert -colorspace GRAY color.pdf gray.pdf
The only drawback I see is that this always seems to choose a gray
colorspace with 256 colors (while the original colorspace may have
(e.g.) 64K colors. Maybe someone else can comment whether the GRAY
colorspace is always 8-bit.
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