How to control canvas color with preview/automator image conversion

I am using an automator workflow (image attached showing workflow) to scale and pad (change canvas size of) images that I am uploading to a website. However, some images will end up having a black canvas while others will have a white canvas post-conversation. I would like all converted images to have a white canvas. Is there a way to ensure this?

Here's a solution that works:
https://discussions.apple.com/message/8402697#8402697
thanks spazek!

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Attachments:
pic.JPG ‏75 KB

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