Gaussian filter looks pixelated

1. Why is my Gaussian blur pixelated in Illustrator?
2. Why is my Gaussian blur white?
3. Why does my vector look pixelated in Illustrator?

Why is my Gaussian blur pixelated in Illustrator?

You need a larger image to get higher quality, there's no way around it. If you have a 300 x 300px image and you shrink it to 64 x 64px, it will look pixelated. There are not enough pixels to contain the same amount of detail as the larger version.

Why is my Gaussian blur white?

Since you're using a Gaussian blur, the edges are going to naturally blend into the background (white).

Why does my vector look pixelated in Illustrator?

Go to Effects>Document Raster Effects Settings and adjust Resolution. Tick the “Anti-alias” checkbox then click Ok. PRO TIP: If you are experiencing pixelation in Illustrator, it is likely because you are zoomed in too far on your image. To fix this, simply zoom out until the pixelation goes away.