Add WebP support to Imagick

On Ubuntu 12.04 ImageMagick doesn't seem to support webp.

convert flyer.png flyer.webp

creates an png file with webp extension.

On https://developers.google.com/speed/webp/docs/using is stated that ImageMagick does support webp

convert --version Version: ImageMagick 6.6.9-7 2012-08-17 Q16

I have both:

• libwebp-dev - Lossy compression of digital photographic images.
• libwebp2 - Lossy compression of digital photographic images.

installed.

Also convert can't decode a webp file.

What's wrong, and is this an Ubuntu bug?

The Ubuntu source package for imagemagick does not declare a build dependency on libwebp-dev. Thus imagemagick gets built without webp support. This could be considered a bug in Ubuntu.

Relevant output from the build process:

checking for WEBP... 
checking webp/decode.h usability... no
checking webp/decode.h presence... no
checking for webp/decode.h... no
checking for WebPDecodeRGB in -lwebp... no
checking if WEBP package is complete... no

And when libwebp-dev  is installed:

checking for WEBP... 
checking webp/decode.h usability... yes
checking webp/decode.h presence... yes
checking for webp/decode.h... yes
checking for WebPDecodeRGB in -lwebp... yes
checking if WEBP package is complete... yes

If you want to fix this just for yourself, you can rebuild the package and install your version:

cd /tmp
mkdir imagemagick
cd imagemagick
sudo apt-get build-dep imagemagick subversion
sudo apt-get install libwebp-dev devscripts
apt-get source imagemagick
cd imagemagick-*
debuild -uc -us
sudo dpkg -i ../*magick*.deb

Reference: http://askubuntu.com/questions/251950/imagemagick-convert-cant-convert-to-webp