Have you considered using hatching?
>
> Greetings
>
> An email from a color-blind user of my NCARG-produced filled contour
> plots has requested any help I could provide in additionally labelling
> the plots. I might add contours with numbers to the plots but on many
> there are so many values/colors (up to 22 - i have to go through the
> color wheel twice and use strong/weak intensity to distinguish them)
> that they would be very difficult to read and would also get in the
> way of those just trying to use the colors. There may well be no good
> solution, but I just thought I'd see if anyone else has run into this
> question and if so how they have dealt with it.
>
> Jack
>
> --
> MAIL| Dr. John W. (Jack) Glendening Meteorologist
> SENT| Naval Research Lab - Monterey glendening AT unknown
> FROM| 7 Grace Hopper Ave Monterey, CA 93943 831-656-4725
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