From a Text File

You can make a text file of the RGB intensities and use TRANDAT to create the NDF , or manipulate the colour table and then save it in a lookup-table NDF. If you choose the second option remember that all RGB intensities must lie in the range 0.0-1.0, where 1.0 is the maximum intensity; and that equal red, green, and blue intensities yields a shade of grey. So for example if you want a six equal blocks of red, blue, yellow, pink, sienna and turquoise you could create the text file col6.dat with contents

     # Red, blue, yellow, pink, sienna, and turquoise LUT
     1.0 0.0 0.0
     0.0 0.0 1.0
     1.0 1.0 0.0
     0.9 0.56 0.56
     0.56 0.42 0.14
     0.68 0.92 0.92

and then run TRANDAT to make the NDF called collut6.

     % trandat col6 collut6 shape='[3,6]' auto