Reverse Grayscale Image Pixel by Pixel - c

Question

I'm trying to write a C program that takes a .raw grayscale image and reverses it, pixel by pixel.
I store each pixel in a 1D char array, and then write each pixel to an output file, just in opposite order.
My program works if I try to reproduce the image, but if I try modifying the indices of my array, I produce an unreadable file.
Reproduce Original
#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *fin, *fout;
char ipath[64], opath[64], *rev, px;
int i, row, read, width, height;
printf("Name of input file: ");
scanf("%s", ipath);
printf("Name of output file: ");
scanf("%s", opath);
printf("Width of image: ");
scanf("%d", &width);
printf("Height of image: ");
scanf("%d", &height);
fin = fopen(ipath, "rb");
fout = fopen(opath, "wb");
rev = (char *)malloc(width * sizeof(char));
row = 0;
while(row < height)
{
for(i = 0; i < width; i++)
{
read = fread(&px, sizeof(char), 1, fin);
rev[i] = px;
}
for(i = 0; i < width; i++)
if(i < width && row < height)
fwrite(&rev[i], sizeof(char), 1, fout);
row++;
}
fclose(fout);
fclose(fin);
return 0;
}
Reverse Image
#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *fin, *fout;
char ipath[64], opath[64], *rev, px;
int i, row, read, width, height;
printf("Name of input file: ");
scanf("%s", ipath);
printf("Name of output file: ");
scanf("%s", opath);
printf("Width of image: ");
scanf("%d", &width);
printf("Height of image: ");
scanf("%d", &height);
fin = fopen(ipath, "rb");
fout = fopen(opath, "wb");
rev = (char *)malloc(width * sizeof(char));
row = 0;
while(row < height)
{
for(i = 0; i < width; i++)
{
read = fread(&px, sizeof(char), 1, fin);
rev[width - 1 - i] = px;
}
for(i = 0; i < width; i++)
if(i < width && row < height)
fwrite(&rev[i], sizeof(char), 1, fout);
row++;
}
fclose(fout);
fclose(fin);
return 0;
}
For testing purposes, I've just used scanf() though I'm aware of its issues.