This is the library by @Shinmera. It does one trivial thing - shrinks images, squeezes them into smaller thumbnails. Actually, it is a wrapper around ImageMagick.
The cool thing about this library is that it is able to preserve GIF animations. This way you can create animated avatars for users of your next-generation Facebook killer social network, written in Common Lisp!
For example, let’s pretend the user loads this cute dog animation which has 800×800 pixels size, and weights 44KB:
If we want our avatars to be 64x64 pixels, then trivial-thumbnail will
help us:
POFTHEDAY> (trivial-thumbnail:create "docs/media/0200/dog.gif"
"docs/media/0200/small-dog.gif"
:width 64)
#P"docs/media/0200/small-dog.gif"
Here is the result:
To make it work you have to install ImageMagick. On OSX the easiest way to do this is to use Homebrew:
brew install imagemagick
There are also other options. They are covered by documentation.
Seems this is a cool library to make avatars, preview and thumbnails.