color bar when printed in black and white

Dazhong Yin yin at ATMO.ARIZONA.EDU
Sun Feb 20 21:14:45 EST 2005

Hi folks,

I would like to generate a color bar using for shaded plots that if
I print these plots in black and white, the color bar would gradually
increase darkness from bars for small values to bars for big values, or vise
versa. I am no artist and do not know how to mix rgb to get this effect. Has
anybody tried this?

Thanks for help!


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