ImageMagick no decode delegate

Question

I\'m trying to convert an image with imagemagick, but I\'m getting this error:

convert: no decode delegate for this image format `//i.imgur.com/nTheJ.

Answer 1

redhat4.8, If you install from source, may be can try:

yum remove libjpeg

wget http://www.imagemagick.org/download/delegates/jpegsrc.v9a.tar.gz

sudo tar xvf jpegsrc.v9a.tar.gz -C /usr/local/src/

cd /usr/local/src/jpeg-9a

./configure --enable-shared

make

sudo make install

than turn in ImageMagick

cd ImageMagick-6.9.6-4

./configure

sudo make install

sudo ldconfig /usr/local/lib

Answer 2

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.

Answer 3

In my case, the solution was a matter of ending the command with *.{jpg,png} rather than *.

I believe the * was picking up / trying to convert hidden files.

Answer 4

from Phillip Ingram somewhere on the interwebs:

in gentoo use

sudo EXTRA_ECONF="--with-png --with-jpeg" emerge imagemagick"

This is slightly different than Jonathan Horseman's answer since it wasn't an error but rather a need to specify more during the installation.

But the identify command was very useful.

Hope this helps someone (and perhaps me in the future ;).

Answer 5

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.

Answer 6

I faced the same problem recently. After Googling for couple of hours, I found out that reason was a CONFLICT between php extentions Gmagick & Imagick. Commenting gmagick.so in php.ini fixed the problem. Hope this will save someone time :)