Filter + Alpha = Ugly outline?

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Somnivore

Here are two sprites which make up a puppet. The mouth sprite has a color which matches the face sprite, and is intended to blend in and also mask other elements on the face. However, as you can see, there's some undesired darkening on the outside of the mouth sprite's color. The image file is fine, and has zero darkening on its edges.

Turning off filter solves this problem, except I no longer have any kind of filtering for my puppet; I need to be able to display these sprites at a lower resolution which means filtering needs to stay on lest the sprites get much too crispy. The mipmapper seems to use the same filtering method as well.

What might be a solution to this? Another way to filter sprites? Another way to mask them? Ideally the filter just wouldn't add this outline at all.

Schuster

maybe try Fix Border Alpha or premultiply alpha?

Somnivore

@Bishop said: maybe try Fix Border Alpha or premultiply alpha?

Thanks for the recommendation; after some toying around, it would appear the following is necessary to get your sprites exactly as they ought to be:

First, the sprite must be imported Fix border alpha must be on, or else you'll get the border artifacts as seen above Premultiply alpha must be off, or else you'll get ever worse border artifacts even with fix border alpha on

It also seems to be important that the sprite size is a power of two, otherwise the mipmapper goes a little wonky.

Schuster

Yes,...this i forget say ,import texture if are some issues with a sprite...there are some options to fix it