Hello,

I have a matrix A with value varying from -1 to 1.  I hope to use scaled
color based on its value to produce an image of this matrix.

Suppose I hope to label those data in [-1,-0.5] with blue, label those
[-0.5,0.8] with light blue (tone is proportional to its value, e.g.
rgb(1-tone, 1-tone, 1) where tone=abs(A)/0.5), and label those [0.8,1] with
white.

How can I use image() and rgb() to achieve this?  It would be great if I can
have a color scale legend, too.

TIA,
Chris

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