Hi, I have two quadratcounts of two different sets of spatial locations in the UK. I then take the difference of these to produce a final quadratcount. In this final quadratcount some values can be negative (if there where more in the first count) or positive (if there where more in the second). Basically I want to plot this using the image.plot function, but I want all values under 0 to be 1 gradient of color, and all values above 0 to be another gradient (color ramp) of color. Is there a way to specify this in R. Phil -- View this message in context: http://www.nabble.com/Quadratcount-image-plot-colors-tp25216951p25216951.html Sent from the R help mailing list archive at Nabble.com.