[To make a certain area transparent]

I've got a magic wand? Oh dear!

Thank you for quick response, consider the topic as obsolete!

[To make a certain area transparent]

Hello everybody,

could you please give me a hint or a helpful link, how I can change the status of a certain area to transparent?

I know, I can change the "Transparency Alpha" in the colour box, but on screen is still displayed the color. Worse, I need a transparent area for an RPG Maker, and this program doesn't take said area as transparent besides the setting in Paint.net.

May be that question was asked before, but I couldn't find anything for exact this topic.