Hi James,
You can define your own palette for this purpose. You can have a look at
the information in the user's guide for information about this, but it
sounds like you need to define a palette 'by_values', which is where you
associate a particular colour with a contour level value. Start of by
creating a .spk file and have something like
RGB_Mapping_By_value
!SetPt Red Green Blue
at the top of the file. You can then fill in your levels in the first
column, followed by the colour you'd like to associate with that level,
expressed at percentage R, G and B, in the next three columns. For
example, dark gray is something like 30 30 30 and light gray is 75 75
75. Have a look at the grayscale.spk palette file in your ferret
installation (probably somewhere like /bin/ferret/ppl/) for more
inspiration and play around 'til you get what you want.
Hope this helps,
Paul
On Fri, 2006-12-15 at 20:59, jimmyc@iastate.edu wrote:
Hi All-
I need to make a color plot gray.
My values cross 0 and are NOT symmetric.
Is there a way to specify a grayscale such that the grays are skewed:
1. for the positive values go light to medium gray
2. for the negative values go medium to light
all in one palette?
Thanks for any advice.