PDF Conversion: Bluebeam Revu x64 PDF results in white overlay on extracted images (even with -alpha remove)

[nagtilaklaxman]

ImageMagick version

7.1.2-13

Operating system

MacOS

Operating system, version and so on

26.3 (25D125)

Description

When converting a PDF generated by Bluebeam Revu x64, specific images (specifically on Page 2 in my case) are rendered with a solid white overlay.

Even when using -alpha remove and -background white, the underlying image content is obscured by a white block or layer. It appears that ImageMagick/Ghostscript is not correctly interpreting the transparency or layer groups specific to Bluebeam's PDF engine.

Steps to Reproduce

I am using the following command to attempt to flatten the layers and remove transparency:
magick -density 300 input.pdf -background white -alpha remove output-%d.jpg

Expected Result:
A clear rasterised image of the PDF page content.

Actual Result:
The output image contains a white box/overlay covering the actual content of the page.

input.pdf

Images

[snibgo]

The IM results is different to the result shown by Adobe Acrobat Reader, but the same as running Ghostscript directly:

gs.exe -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dPrinted=false -sDEVICE=pngalpha -r72x72 -sOutputFile=x%d.png input.pdf

So the problem appears to be in Ghostscript.