I have some problems with transparency alpha in my cs2d skinning project. This is how it happens:

I made a drop skin for XXX skin. But in game, when the image rotated, the outline of the skin has a bit of whitish. When I rotate it in Paint.Net with a in game background, it seems fine. What should I do to conquer this problem?

Stop making skins if you can't.

@ Gaios: that won't help him, discouraging someone is the worst thing to do.

@ Skyframe: Maybe post a screenshot ingame so we can see it.

All skins images should be oriented upwards.

In order to avoid white edges, you can go two ways:
1st - fill background for your skin with black color with transparency -99%
2nd - or make outline around of your skin with black color edging with transparency -99%

Also, between your skin image and edge of image should be a small distance of at least 1 pixel.

For example, my skins of Tactical Shield from CSO Buymenu images (3D&Flat Style) (13)

Standart edition -
Enegy shield -

In Paint.NET, set the current color to transparent black (0 Red, 0 Blue, 0 Green, and 0 Opacity).
Then click the Erlenmeyer flask icon at the top and switch from "Normal Blending" to "Overwrite".
Next, use the bucket tool to fill up the background, just spam clicks at the background.
Make sure the image is flatenned (single layer), BTW.

What is -99% transparency?
And I didnt see erlenmeyer flash lol...

@ Skyframe: It's a small flask icon with green fluid in it.

Thanks, I found the solution. Thank all of you very much!