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Page 9 of the “Mobile Information Device Profile, v.2.0″ document tells us that a MIDP 2.0 implementation “MUST support PNG image transparency” - anything else is optional.

Some observations from: http://developers.sun.com/mobility/midp/questions/imagetype/

•  PNG was supported on the test platforms
• No other format was supported
• Resource names are case-sensitive
• File sizes for different formats can vary from 9.1 KB (GIF) to 69.5 KB (TIF)

Part of the project for: Bluetooth Push Apps Java ME at a Glance

Gosling ready to kill-off lame duck J2ME