public interface IImageReader
Interface to read am image within the server side image processin (which is
e.g used when image sizes are calculated on server side).
The implementation may return null if it cannot read the image on its own - then
the default way of reading the image is used. The implementation class should
check the image name, if it's applicable for own read-processing and then either return
null (if not applicable) or return the image bytes.
The class is registered in eclntjsfserver/config/system.xml.