Komparator++ v 1.0.2 Needed libraries: libfftw (http://www.fftw.org/install/windows.html) and libnetpbm (http://gnuwin32.sourceforge.net/packages/netpbm.htm) The libfftw3-3.dll and libnetpbm10.dll should be moved in the directory C:\WINDOWS\system Install the C/C++ IDE "dev-cpp" (http://www.bloodshed.net/dev/devcpp.html) Here's what the parameters should look like in dev-cpp: in the Project-> Options (ALT+P) menu in the "Parameters" tab -> "linker" there should be "libfftw3-3.dll" and "libnetpbm10.dll", from the directory C:\WINDOWS\system\ in the "Directories" tab, "Library directories" there should be C:\WINDOWS\system and in the "Include directories" tab: C:\Program Files\libffwt3 and C:\Program Files\GnuWin32\include Then, compile, using Ctrl+F9, this should create the "komparator.exe" file, that you'll have to launch from a DOS prompt: C:\...\komparator -of img1.pgm -df img2.pgm