Speeding up Imagemagick convert by using it in conjunction with Ghostscript

Using the script below resulted in the Imagemagick convert taking 7.5 seconds, compared with the 2 pronged approach taking just over 0.5 seconds


#!/bin/bash

echo "---------------------------------------------------------"
echo "Use ImageMagick to convert PDF to 450x307 jpg"
echo "---------------------------------------------------------"
TT="$(date +%s%N)"

convert -resize 450x307 test.pdf test_resized.jpg

T="$(($(date +%s%N)-TT))"
# Seconds
S="$((T/1000000000))"
# Milliseconds
M="$((T/1000000))"
printf "Run time: %02d:%02d:%02d:%02d.%03d\n" "$((S/86400))" "$((S/3600%24))" "$((S/60%60))" "$((S%60))" "${M}"

echo "---------------------------------------------------------"
echo "Use Ghostscript to convert PDF to 450x307 jpg"
echo "---------------------------------------------------------"
TT="$(date +%s%N)"
gs -sDEVICE=jpeg -dNumRenderingThreads=4 -dNOGC -o test.jpg -dJPEGQ=95 test.pdf 2>&1
convert -resize 450x307 test.jpg test_resized.jpg
T="$(($(date +%s%N)-TT))"
# SecondsS="$((T/1000000000))"

# Milliseconds
M="$((T/1000000))"
printf "Run time: %02d:%02d:%02d:%02d.%03d\n" "$((S/86400))" "$((S/3600%24))" "$((S/60%60))" "$((S%60))" "${M}"
echo "---------------------------------------------------------"

Upgrade Ghostscript and Imagemagick on a Centos server

The following script can be used to remove a previous instance of Ghostscript and Imagemagick from a Centos based server and re-install the current versions.


A manual upgrade is required as the Centos repo does not currently have Ghostscript v9 (which is required to use the inkcov device example here).

#!/bin/bash
yum remove imagemagick -y
yum remove ghostscript -y

cd /tmp


wget http://downloads.ghostscript.com/public/ghostscript-9.07.tar.gz
wget ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick.tar.gz


tar xf ghostscript-9.07.tar.gz
tar xf ImageMagick.tar.gz


cd /tmp/ghostscript-9.07
autoconf
./configure
make
make install

cd /tmp/ImageMagick
autoconf
./configure --enable-shared \
           --with-modules \
           --with-perl \
           --with-x \
           --with-threads \
           --with-magick_plus_plus \
           --with-gslib \
           --with-wmf \
           --with-lcms \
           --with-rsvg \
           --with-xml \
           --without-dps
make
sudo make install
sudo ldconfig /usr/local/lib




cd /
rm -Rf /tmp/ghostscript-9.07
rm -Rf /tmp/ImageMagick

echo "Done!"