Hello I am writing to mention a problem I have encountered when trying to vectorize a binary image of segments (georeferenced). The problem occurring is that ENVI is vectorizing both the internal size of the binary image and the external one. In this way the 1 pixel edge image is converted 2 vector polygon. Is there a way to specify to ENVI (or IDL) to only vectorize the outer boundary of the binary image ? Thank you in advance Dimitris