Export to PNG, Unwanted Minuscule, Dark Outline on White Shapes

[TanookiMario]

I have created the attached snowflake shapes in AFD2, they are curves made up of several rectangles each. Unfortunately when I export the shapes to PNG (as needed for my website) and upload them to my website, they appear with a very small, pixelated, black outline (as shown).

Any help appreciated!

Edited March 13, 2023 by TanookiMario
Added more information.

[lepr]

Hi and welcome to the forums!

Please attach the Affinity file so there is no ambiguity about the content of your document, and then appropriate advice instead of guesses can be given to you.

[TanookiMario]

3 hours ago, ,,, said:

Hi and welcome to the forums!

Please attach the Affinity file so there is no ambiguity about the content of your document, and then appropriate advice instead of guesses can be given to you.

Here is the file in question!

ICON FINAL.afdesign

[stokerg]

Hi @TanookiMario,

While I don't have a site I can upload the image to, I've exported your image out as a PNG and quickly made a HTML page to just load the image and it loads fine locally, see attached image.  Also viewing the exported image, it also views fine.  It's likely something on your server is resampling the image and causing the issue. 

[lepr]

The exported PNG will be straight RGBA, but my guess is some software is assuming the PNG is premultiplied RGBA and unpremultiplying it before resampling it to the lower resolution seen in your screenshot.