- sum -= sharpen_getpixel(x - 1, 0);
- sum -= sharpen_getpixel(x - 1, 1);
- sum -= sharpen_getpixel(x - 1, 2);
- sum -= sharpen_getpixel(x + 1, 0);
- sum -= sharpen_getpixel(x + 1, 1);
- sum -= sharpen_getpixel(x + 1, 2);
- sum -= sharpen_getpixel(x, 0);
- sum -= sharpen_getpixel(x, 2);
+ sum -= sharpen_getpixel(b - 1, 0);
+ sum -= sharpen_getpixel(b - 1, 1);
+ sum -= sharpen_getpixel(b - 1, 2);
+ sum -= sharpen_getpixel(b + 1, 0);
+ sum -= sharpen_getpixel(b + 1, 1);
+ sum -= sharpen_getpixel(b + 1, 2);
+ sum -= sharpen_getpixel(b, 0);
+ sum -= sharpen_getpixel(b, 2);