[magick-users] Problem converting large tiff pictures

[duc.sequere.aut.de.via.decede at imagemagick.org]

> easible time (around 20 seconds would be nice).

If it takes longer than 20 seconds it because you do not have enough memory
to hold the image in memory.  Try

  convert -debug cache image.tif -thumbnail 800x600 thumbnail.tif

The debugging output most likely says your pixels are being cached to disk.

The solution is to try the Q8 version of ImageMagick which uses 1/2 the memory
or add more memory to your computer, or use another more memory efficient
program.