🚀 go-pugleaf

Hi X world,

    I got a question about colormap. I need to plot a color picture of 
temperature field. I would like to code the temperature field as red for 
highest temperature and blue for lowest temperature in a geometric
domain. The color should be changed linearly from red to blue with the 
temperature from highest to lowest. 


    The colormap I need should be a standard spectrum like we see from physics
textbook. When the pixal values go from 2 to 256, the colors vary from red
orange, yellow, green ... blue.


    Thanks in advance.


     --yanling