#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    FILE *f = fopen("graf.mif", "rb");
    fseek(f, 0, SEEK_END);
    int size = ftell(f);
    fseek(f, 0, SEEK_SET);
    unsigned char *buffer = (unsigned char*)malloc(size);
    fread(buffer, size, 1, f);
    fclose(f);

    unsigned char *p = buffer;
    int num_img = *p++;
    p += num_img*8;

    for (int i=0; i<num_img; ++i)
    {
        p += 64000;
        for (int j=0; j<768; ++j)
        {
            unsigned char color = *p;
            *p = color << 2;
            p++;
        }
    }

    f = fopen("graf.mif", "wb");
    fwrite(buffer, size, 1, f);
    fclose(f);

    free(buffer);
    return 0;
}