[vtkusers] 2D Image viewing revisited

[John Biddiscombe]

Dear anyone,

The question of 2D image viewing has cropped up several times lately and I 
wonder if there is a "best" way of implementing this. I've written what 
seems to me to be a very cumbersome and lengthy implementation of image 
zooming, panning, region selection and had to modify vtkActor and 
imagemapper  and renderwindow to get it working the way I want.

It seems there ought to be an easier way of achieving it by simply setting 
camera projection to parallel, altering the viewing angles and zoom etc 
etc. My question is...

How does everyone else view 2D images, select regions, magnify them and 
zoom in on interesting features etc?

thanks

JB