Photohawk is a pure Java implementation of the following image comparison algorithms:

• Absolute error
• Equals
• Mean absolute error
• Mean squared error
• Peak absolute error
• Structured similarity metric

Additionally it packages the implementation as a Taverna plugin for use in a Taverna workflow.

Install the Taverna plugin

1. Open Taverna
2. Add the plugin site
   1. Open Menu -> Advanced -> Updates and plugins -> Find new plugins -> Add update site
   2. Choose a site name
   3. Enter the site URL http://datascience.github.io/photohawk/taverna/updates/2.4.0/release or http://datascience.github.io/photohawk/taverna/updates/2.4.0/snapshot
3. Install the plugin
   1. Tick the checkbox next to Photohawk Taverna plugin
   2. Click Install
4. Restart Taverna