I changed the scaled-image macro to use the Snipsnap attachment API properly. A user found a bug and suggested a fix. I made a new release snipscale 1.0.4.
A user found out that the scaled-image macro didn't work for him. It turned out he uses MySQL as the storage backend for Snipsnap; the macro assumes that a directory for the snip attachments exists, but this is not the case when you use MySQL.
Luis Arias made a fix to check if the directory exists and create it if it doesn't exist. I made a new release snipscale 1.0.2. I will need to look into the Snipsnap API to see if attachments can be handled more elegantly.