inverted color in pdf preview?

by DMAC   Last Updated January 05, 2018 22:07 PM

We have been using PDF Preview for years, and it has worked flawlessly ever since. Today, we had a client upload a PDF and the preview that is generated is an inverted version of that PDF, instead of a exact preview of the pdf.

We have tried reuploading and resaving with the same results. Re creating the node does the same thing, so we are assuming this is an issue with the PDF meta data that is interacting with the PDF Preview module in an unexpected way which is inverting the colors on the PDF. Uploading any other PDF we have does not do this, only this particular PDF.

Inspecting markup shows literally no difference in markup between inverted and all the non inverted. And when I click on the PDF it shows up correctly. But the preview generated is inverted.

Anyone know what can cause this? Could this be some kind of PDF markup issue interacting with the PDF preview module? Not finding anyone else with this issue.

The PDF Preview is the only place which shows the PDF as inverted.

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