About aliasing

I draw image in my application, and it has aliasing.I use the rendering hints, but it seems not to work. When I zoom in or out the image, its edge jag . Only when the image is the orginal size, it displays well.

So how can I remove the aliasing and keep the edge clear?

Pardon for my poor English.

Thanks if anyone could help me!

[354 byte] By [mys_mma] at [2007-10-3 4:01:46]