plone/plone.outputfilters — comment on commit 80241db44694dbe28136e203212ae83626f3df6d
File:  line 0
By yurj:

I would use the description of the image as the "title" attribute:

if fullimage is not None:
# Check to see if the alt / title tags need setting
title = aq_acquire(fullimage, 'Title')()
if 'alt' not in attributes:
attributes['alt'] = title
if 'title' not in attributes:
attributes['title'] = description or title

I think it is better, and title is given if a description is missing