Pdf with white background converts to transparent png

This PDF, and several like it, when converted to png using groudocs convert cloud, end up with a transparent background. Any ideas why?
Text Alignment Test.pdf (11.1 KB)

Text Alignment Test.pdf_converted.png (4.3 KB)

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@cpopetz,
On my opinion, this is a bug. I have checked out the conversion and found that there is a BackgroundColor option, which has “white” color value by default and the output should have white background also. I think we should fix this and also add support BackgroundColor option to Conversion.Cloud as well.

We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.

Issue ID(s): CONVERSIONCLOUD-604

Thanks Sergei.