In order to get performance information using gprof, copy the CImg folder containing all source files to matrix. CImg is built to be cross-platform and should work as is. Some background information on what makes that is possible [http://cimg.eu/reference/group__cimg__overview.html can be found here]. [http://cimg.eu/reference/group__cimg__environment.html Environment variables] are automatically set based on OS, routing the program to appropriate paths of logic.

Update Rotate.cpp to use relative paths to the .jpg files using Unix forward slash: