ImageMagick no decode delegate

I had this error when rendering an image using DragonFly in Rails. This happened after I upgraded to Lion (ImageMagick was installed using Brew).

I reinstalled ImageMagick, jpeg, libtiff and jasper (reinstalling ImageMagick wasn't enough by itself).

brew uninstall imagemagick jpeg libtiff jasper
brew install imagemagick

Prior to that, running

identify -list format

and jpeg wasn't in the list. After reinstalling the above packages jpeg appeared in the list.

on Ubuntu 16, I had to install the following first (this was not a dev machine but a server):

sudo apt-get install autoconf automake autotools-dev libtool pkg-config 

then to enable the PNG and JPG delegates :

sudo apt-get install libpng12 libpng12-dev libjpeg libjpeg-dev

followed by

./configure

(Which should now show that the delegates are enabled)

and then rebuild (make clean && make then sudo make install)

for me:

 brew reinstall imagemagick --with-libtiff

saved the day when dealing with a similar problem, but for tiff files.

UPDATE: one year later and this remains the only way I can get tiff working properly in convert on MacOS X.

substitude the × in -resize 600×600 with a capital X and it should work.

-resize 600X600