Sometimes my images nicely fit into the rest of the body of the question. Most of the time they are too large. Is it possible to rescale them after posting?
If not can we have that?
You can scale down images by appending
s to the filename, before .extension.
After upload, the image below was named
l version with URL
http://i.stack.imgur.com/2pBS0l.png; the images scaled with
l should not be wider than the allocated horizontal space for the display of question and answers.
And then I changed the URL to
http://i.stack.imgur.com/2pBS0m.png for the medium version
and finally here's the small version with URL
I also found this: What HTML tags are allowed on Stack Exchange sites? which allows quite some control over the image properties:
<img src="http://i.stack.imgur.com/2pBS0.png" width="137" height="42" alt="" title="">
<img src="http://i.stack.imgur.com/2pBS0.png" width="666" height="666" alt="" title="">
It also seems possible to scale the images when you upload them, with this user-script: