How to use the convert utility of ImageMagick to perform various file format conversions.

ImageMagick configuration on Gentoo/Praxis.

media-gfx/imagemagick-  USE="X -autotrace bzip2 corefonts cxx -djvu -fftw -fontconfig -fpx -graphviz -hdri -jbig jpeg -jpeg2k lcms -lqr lzma -opencl -openexr openmp pango perl png -postscript -q32 -q64 -q8 -raw -static-libs svg -test tiff truetype webp -wmf xml zlib"

Convert PDF to PNG

Yes, on Linux this is really one-line simple.

~ $ convert source.pdf output.png

Make a bunch of PNG from SVN icons

cd /usr/share/icons/Tango
for s in 16x16 22x22 24x24 32x32 48x48 64x64 72x72 96x96 128x128
    convert ./scalable/apps/roxterm.svg -resize $s ./$s/apps/roxterm.png;