StackBlur does not work properly when there is an alpha channel in the image.

[flexeo]

StackBlur does not work properly when there is an alpha channel in the image.

There is a white outline in the result: [](https://jsfiddle.net/badabou/e3bq8s2r/1

[flozz]

StackBlur is not very good with alpha channels :(

[flexeo]

Do you think it's complicated to make a fix?

[flozz]

I do not think it is simple to fix, as transparent pixels also have values on R, G and B channels... Here is what your image looks like if you remove the alpha channel:

FYI, I am not the author of this algorithm, I just made little fixes and packaged it on NPM. I am afraid I am not able to make changes like this one... :(