FFH's avatar standard is 80x96, while in-game portraits are 32x48 stretched to 40x48.
Thus, to reproduce the same effect while minimizing quality loss, we can:
- Resize to 800%, or to 256x384, with the nearest neighbor option
- Change the color mode to RGB
- Resize down to 80x96 (31.25% x 25%), with the regular bicubic option (not smooth or sharp)
- Upload!