#include <stdio.h>
  2
  3 // Struct to hold each pixel value
  4    struct pixel
  5    {
  6       unsigned char red;
  7       unsigned char green;
  8       unsigned char blue;
  9    };
 10
 11 // Struct to hold the image type values
 12    struct imageType
 13    {
 14       char type[3];
 15       char comment[256];
 16       int width, height;
 17       int maxcolor;
 18       struct pixel image[1000][1000];
 19    };
 20
 21    int main ()
 22    {
 23
 24 // Opening the input file, reading in image filenames during execution
 25       FILE *inputfile;
 26       char filename[30];
 27       fprintf(stderr, "Enter the image file name.\n");
 28       fscanf(stdin, "%s", filename);
 29       inputfile=fopen(filename, "r");
 30
 31       struct imageType imageA;
 32       char newlinechar;
 33
 34 // Reading in the image type values
 35
 36       fscanf(inputfile, "%[^\n]%c", imageA.type, &newlinechar);
 37       fscanf(inputfile, "%[^\n]%c", imageA.comment, &newlinechar);
 38       fscanf(inputfile, "%i", &imageA.width);
 39       fscanf(inputfile, "%i", &imageA.height);
 40       fscanf(inputfile, "%i", &imageA.maxcolor);
 41
 42 // Read in and store the pixel color values
 43       int j,i;
 44       for(j=0; j<=imageA.height-1; j++)
 45       {
 46          for(i=0; i<=imageA.width-1; i++)
 47          {
 48             fscanf(inputfile, "%hhu", &imageA.image[j][i].red);
 49             fscanf(inputfile, "%hhu", &imageA.image[j][i].green);
 50             fscanf(inputfile, "%hhu", &imageA.image[j][i].blue);
 51          }
 52       }
 53
 54 // closing the input file
 55       fclose(inputfile);
 56
 57 // Opening the output file
 58    FILE *outputfile;
 59    outputfile=fopen("newimgBerg.ppm", "w");
 60 // Creating the P6 image type
 61    fprintf(outputfile, "P6\n");
 62    fprintf(outputfile, "%s\n", imageA.comment);
 63    fprintf(outputfile, "%i %i\n", imageA.width, imageA.height);
 64    fprintf(outputfile, "%i\n", imageA.maxcolor);
 65
 66 //mirror image vertically
 67
 68
 69 // Horizontal flip
 70    for(j=0; j<=imageA.height-1; j++)
 71       {
 72          for(i=0; i<=imageA.width-1; i++)
 73          {
 74             struct pixel temp = imageA.image[j][i];
 75             imageA.image[j][i]=imageA.image[imageA.height-(j+1)][i];
 76             imageA.image[imageA.height-(j+1)][i]=temp;
 77             fprintf(outputfile, "%c%c%c", imageA.image[j][i].red, imageA.image[j][i].green, imageA.image[j][i].blue);
 78          }
 79       }
 80 // Closing the output file
 81    fclose(outputfile);
 82       return 0;
 83    }