White edge around rotated object

[feelixe]

When i rotated an image there a very thin white edge around it. Clamp wrap should be on be default so i don't really understand.
Here's a screenshot of how it looks ingame: http://gyazo.com/275b7da19b8d736d49f52d9281df514f
Anyone got a clue? Thank you

[Gorus]

Please post the code you use to rotate the image.

[DaedalusYoung]

This is caused by the underlying colour of the transparent areas of your image. Try filling the background with black, and alpha at 0, or even the colours of the neighbouring pixels with alpha at 0, in your favourite image editor.

[nuno]

This is caused by the underlying colour of the transparent areas of your image. Try filling the background with black, and alpha at 0, or even the colours of the neighbouring pixels with alpha at 0, in your favourite image editor.

if alpha is 0, does it matter if the color is black or white?

[Nixola]

It does, in this case

[slime]

if alpha is 0, does it matter if the color is black or white?

It does if he's using linear filtering and isn't using premultiplied alpha plus the premultiplied blend mode.

Some technical info:
http://blogs.msdn.com/b/shawnhar/archiv ... alpha.aspx
https://developer.nvidia.com/content/al ... or-not-pre

[feelixe]

Thanks alot, i'll try it when i get home:)

[feelixe]

I tried it now and it didn't work :/ I probably did something wrong, i opened the .png and made a second layer and filled it with black and set transparancy to 0. Maybe photoshop does something?

[micha]

In most drawing programs you can set the background color. Somewhere in the document settings. It is important that you set the background color to transparent black, instead of having a layer that is fully transparent. At least from what I know.

[Germanunkol]

As the others said, the background colour is the issue. Here's a tutorial for how to change that in gimp:
http://love2d.org/forums/viewtopic.php? ... mp#p131621