gray2

g ({% 1 %s}*.3 + {% 2 %s}*.59 + {% 3 %s}*.11)/255[no url encoding]

Computes the grayscale level for an RGB color, using the formula reported by
Craig Markwart on the IDL newsgroup http://www.dfanning.com/ip_tips/color2gray.html

Example: gray 0 255 100

Uses Google Calculator to do the arithmetic, and Fuska's % command 
to handle positional parameters.

20 uses - Created 2006-05-05 23:10:36 - Last used 2006-09-14 19:55:50

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