white halo around certain sprites but not others

[RonanZero]

So every single sprite in my game is fine except one... this is just like any other sprites, nothing special about it but for some reason it has a weird white halo around it. The halo only appears when it's rotated, it looks normal when not rotated. This is what it looks like:

and this is what any other sprite in the game looks like, even when rotated (compared with the other sprite):


Things I've tried so far (that didn't work):
- switching the laser object's sprite to the ship sprite. (the ship sprite still looks fine)
- setting the default image filter to nearest.
- messing around with the files and comparing the images closely.
- flooring the x, y, and rotation.

[zorg]

Can you link to the problematic sprite's image file? I'm guessing your image editor blurred the outline's outer edge when you made it transparent... if you did it like that; nevertheless, i'd wager the problem being somewhere around there.

[micha]

The problem comes from mixing the transparent pixels with the colored pixels. In this case it makes a difference, whether the background is black-transparent (0,0,0,0) or white-transparent (255,255,255,0). To solve the issue, set the background of your image to the same color as the outline of the object and then make it transparent.

[RonanZero]

The ship's sprite has a white transparent background and it works fine. And as far as I know, Paint.NET doesn't save color data for transparent or non-saturated pixels.

[micha]

Could you upload a minimal example .love file, so that we can have a look at it?

[RonanZero]

https://www.mediafire.com/?4fexr73dlbxk34l

[micha]

Thanks.

It turned out my initial guess was correct. The red bullet image had "white-transparent" pixels in the background. Here is a .love with the original image and a corrected one (black-transparent).

You can press and hold spacebar to stop rotation.