very first version of a screen correction tool.
combination of the ibk color node to generate a cleanplate and steve wrights concept descriped in 'digital compositing for film & video'
originaly designed for shake by my 'brother' creewee, now available for nuke with some minor changes like the ibk color node for the cleanplate.

its still a group since its not finished

just add this

(your custom toolbar)Toolbar.addCommand('Key/cleanscreen', 'nuke.createNode("cleanscreen_group.nk")')

to your menu.py