Folks:
I’m putting text on an image that will be turned into a snapshot. The image 
goes from light to dark. The text is a one or two digit integer. I want it to 
show up on the image. For dark parts of the image, I set it to yellow, but for 
light parts of the image, I want to set it to black. Is there a simple formula 
for changing an rgb value into a darkness value that will let me choose between 
yellow or black text?  I don’t want to just set the ink of the text because 
sometimes I write the text over itself, which diminishes the effect.

Thanks,
Bill

William A. Prothero
http://es.earthednet.org/

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