Graphics degradation on android

Hi all,
I compiled apk on android and was disappointed by graphics quality.
here example:
http://s017.radikal.ru/i431/1209/76/0ef4eb4e3e90.jpg

Screen from left side - from win32 application, from right side - screen on android device. As you can see - on right picture graphics degradation observed.

How to solve this problem?
Is this issue contained in CCconfig.h? Or in another configuration file? Or it is problem of .png files?

Anyone encountered this problem? Please, help !