White border around sprites

[Sky Ninja]

In my wad in putting some tree's from Green Hill Zone as a replacement for the plain bush, and it has a white border around it. How do i get rid of the border?

 

[BlueZero4]

You didn't use the cyan transparent color to back your sprite.

 

[Sky Ninja]

Actualy, I did, and it turned white.

 

[BlueZero4]

Check to see if it's the right cyan color, or if your sprite itself has the white outline.

 

[Sky Ninja]

I used the cyan used on SRB2 Wiki.

 

[I'll Begin]

Your sprites are anti-aliased.

Meaning, their outline got mixed with a white background. You can fix it by manually fixing each pixel, or by not using those sprites.

 

[Sky Ninja]

Could it have something to do with the fact that I'm using SLumpEd? I tried using XWE, but it kept saying that someting was wrong with it.
EDIT: It was a problem with SlumpEd. I got XWE working, and now the sprite comes out perfectly. :D