Improve Image quality dynamically

Hi all
here is the my question

I have a flipbook component in which i am loading images dynamically
The image are of 300 dpi. The width and height of the images are bigger than the book component size.
My problem is when I load the images into the component they are getting scaled to the book size which is fine, but the image quality goes down which I don’t want. Also when I zoom the page (by scaling the movieclip in which I have loaded the book componet) the images loose the quality.
Is there any way to prevent this?
Can using bitmapdata help?

Any help??

Thanks in advance!!

Trupti