As in the icon in UTAU or what? If you're talking about the icon, I've never figured out what does it. You might have to resize it externally (outside of the program).
UtaForum.net
Avalia-Kasa
Animé Fan
When I uploaded my images, they ended up zoomed into one part of the picture.
Avalia-Kasa
Can you show me a screenie?