bmp / jpeg or png - smallest file size and best compression

I am building an app that i think can take bmp / jpeg or png - and wanted to know (to keep the apps total size down, what is the best format for the images in relation to lowest file size and
best compression upon those images.
nathan1038Asked:
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Philip_SparkConnect With a Mentor Commented:
Use the save for web &/or devices section of Photoshop, where you can compare side by side various compression models/formats.
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alien109Commented:
it depends on the type of image it is. Generally line art and images with fewer colors and more broad areas of colors compress best with gif. PNG also works well, but usually will be a larger file (better qualiity however). Photos will compress much better usually using JPG. But You have different options and levels available when compressing using JGP, so it depends.
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nathan1038Author Commented:
They are web type graphics
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nathan1038Author Commented:
I think i am going to use png - so can i compress a png throgh photoshop, whats the best way to compress a png
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alien109Commented:
do a  file>save for web, in Photoshop.
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Philip_SparkCommented:
as I said
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