Follow-up Comment #7, bug #20317 (project mypaint):
Greyscale filtering for a tdw isn't too tricky: I made an experimental
display-side colour filter hack a while back that could be reused:
https://gitorious.org/~achadwick/mypaint/achadwick-mypaint/commits/display-filters
(just rebased against current master). Doing it in Python isn't the fastest
approach, but it works.
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