[Image-SIG] Create a 'disabled' image effect (similar to how Windows shows disabled images)

[python at bdurham.com]

Any suggestions on a PIL receipe that will allow me to take a
color image and create a grayscale version of this image that
gives the image a disabled appearance similar to the effect that
Windows applies to show disabled icons?

My use case is to dynamically create disabled versions of my
application's graphics when a specific feature is disabled or
unavailable.

Thank you,
Malcolm
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