Celestia Forums

I am attempting to make a new overlay for Celestia-ED. I have a PNG image that will appear on the screen when overlay is enabled, but there are no transparent areas.

How is the transparent area defined?

Is there a specific RGB value needed for a transparent area?[/img]

There's no need to post the same message more than once. If a response seems to be slow in coming, you just need to be patient. (I'll delete the other one.)

Transparency is controlled by the Alpha channel in the image file: RGBA = Red, Green Blue, Alpha. Think of it as an Opacity channel. You can use either a paint program or an image manipulation utility package like ImageMagick to create and insert the Alpha channel.

Sorry, new to the forum. Thought that I had posted to the wrong group and did not know how to move the post.