This is what I use: int convertWarframe(char* pngFileWF) { FILE* fIn = NULL; FILE* fOut = NULL; char* pixels0; char* pixels1; char* pixOut; fIn = fopen( pngFileWF, "rb" ); strcat( pngFileWF, "_reversed.png" ); fOut = fopen( pngFileWF, "wb+" ); fseek( fIn, 0, SEEK_END ); int fSz = ftell( fIn ); fsee...