I have run into problems viewing some PDF files in Preview that fails to show images, but no such problem when I open the same files in Adobe Acrobat. Preview didn't have this issue when I had OS 10.9 installed. Since the upgrade to OS 10.11 then 10.12 a few months ago, the problem appeared.
Some of the PDF files that I download or receive in email contain an alpha channel. I only learned about this when Preview failed to display the file content properly and I opened the file in GraphicConverter which showed the checkered transparent alpha channel layer. I don't know what is the need of the alpha channel, perhaps for printing?
Is it possible to flatten the alpha channel in Preview or Acrobat? One such PDF file is this. Click the "Download PDF" button at right.
Some of the PDF files that I download or receive in email contain an alpha channel. I only learned about this when Preview failed to display the file content properly and I opened the file in GraphicConverter which showed the checkered transparent alpha channel layer. I don't know what is the need of the alpha channel, perhaps for printing?
Is it possible to flatten the alpha channel in Preview or Acrobat? One such PDF file is this. Click the "Download PDF" button at right.
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