Best image format for tray icon

I created a Java application with tray icon. I am using a transparent png image. However, the rendered icon is very ugly on all platforms, including Windows 7 and Linux.

Are there any good practices for creating tray icons (e.g. format, size, 开发者_Python百科etc.)?

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In windows, you should use the .ico format. It may contain multiple icons with different sizes. In Linux I guess png is the standard. Just don't try to scale it. Pre-create multiple versions of the same image with different sizes.

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There is no "known solution" for this problem as far as i know. You should switch your transparent icons to square ones. You can check this question for deeper information;

java TrayIcon using image with transparent background