Hi Jack,
convert Graphics to a Canvas
Image[ Plot[x,{x,0,1}]]
click on the graphics.
The toolbar pops up under the image.
From there its like navigating in typical windows labyrinth of menu trees. But with some intuiton and graphics experience (fro me best from working with Adobe Illustrator) everything can be done.
Deep image analysis applying different filter families can be reached via the more... button.
Regards Roland