Hello,

I am working on mapping gene expression data of microarray to color coded images. Specifically, the image is a line drawing of a plant with each organ coded with a unique color. The expression data correspond to different organs. I want to map these data to the corresponding organs. The desired outcome is very similar to examples here: http://efp.ucr.edu/cgi-bin/absolute.cgi

Based on my search, it seems the ggplot2 package can fulfill such a mapping, but I didn't find any related tutorials. Can anyone give any suggestion?

Thanks a lot.

Regards,

Jianhai