[scribus] automatically determining when white is a good text color for book cover

[Fred Zimmerman]

I want to be able to look at the fill color for my book cover (the
background) cover and determine programmatically what the text color should
be. I usually use dark colors (maroon, navy, etc.) with white text (just a
matter of house style) but at a certain point a color becomes "too light"
for the text to be white.  How can I decide that programmatically and
automatically revert to black? Also, is there more to the color issue than
that? how can I determine programmatically when colors other than black and
white might work well for text?

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