Exported PNG from Blur TOP shows dark edges on transparency

[morekid]

Hi, I am trying to export a PNG with transparency from the output of a Blur TOP.

Although the edges look cleanly blended in the TOP preview, they are dark, blackened on the exported image.

How can I export a PNG with clean edges? I’ve tried changing a number of settings in the involved OPs with no success, perhaps I’m missing something basic.

Thanks

Network:

Exported PNG:
PNG_transparency_test.toe (3.6 KB)

[snaut]

Hey @morekid,

it seems like saving the png premultiplies the color with the alpha. To counteract this, use a Math TOP before the Movie File Out and set the Operation parameter on the Multi-Add page to “Divide RGB by Alpha”.

Hope this helps
cheers
Markus

[morekid]

Works perfectly Markus, thanks!