General improvements / new features:
Green Screen improvements: add new Feathering parameter. This has a similar effect to the Fading parameter (make pixels semi-transparent) but it only affects the boundary between the foreground image and keyed out background. Both can be used to make leftover green pixels blend in with the new background. Note that Feathering is significantly slower than Fading, especially as the Feathering value gets large.
'Brightness' mode in Green Screen changed to 'Color + Brightness', giving a better key overall.
Improved performance when reading fro