Introduction - If you have any usage issues, please Google them yourself
File Description: function.h stated function.cpp function function function call function to achieve main.cpp Description: ppmtoppm (char* in, char* out) read ppm24-bit color images, the output ppm24 bit grayscale images ppmtopgm (char* in , char* out) read ppm24-bit color images, grayscale color output pgm256 ppmtobmp (char* in, char* out) read ppm24-bit color images, the output bmp24 bit color images