[android-developers] Can I decide how bitmaps are compressed via png?

Hi,
Is it possible to determine that a bitmap is compressed (programatically, of course) as a png image with an 8 bit color palette? 4 bit?
I know there are different types of png compressions, can I decide which type is used?
If the answer is no, can anyone recommend a method for doing so?

Thank you in advance

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