Of course, a picture on a computer monitor is a coloured plot of x and y coordinates or pixels. Still, I was smitten by David Sparks’ posts on is.r(), where he shows how easy it is to read images into R to analyse them. In two posts ,  he replicates functionality of image manipulation programmes like GIMP.
I can’t resist to write about this here as well. David’s first post is about k-means cluster analysis.