Hello, well I'm new at programming and C++, but for a program I am developing I need to use an image descriptor for a function that gets the RGB values from the image descriptor (the functions are from http://www.catenary.com) anyway I'm not sure I'm understanding everything about an image descriptor. I have read a few things about them and understand that they contain information about the image. It seems in the sample code I'm using though the image descriptor is never intialized. I need to have the image descriptor referring to an image on file (more specifically I need it to access the last photo saved by my program but that's not really relevant). So can anyone describe a way to do this or if this is even how image descriptors work?