[okular] [Bug 394159] New: Feature Request: Mode for comparing files by overlaying

[nuntius35]

https://bugs.kde.org/show_bug.cgi?id=394159

            Bug ID: 394159
           Summary: Feature Request: Mode for comparing files by
                    overlaying
           Product: okular
           Version: unspecified
          Platform: unspecified
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: nuntius35 at mailinator.com
  Target Milestone: ---

While working on typographical details it is sometimes useful to compare two
different pdf files. Ideally, one version of a document is transparently
overlayed onto another for closer inspection. Likewise, there are situations in
which one wants to visually verify that the typesetting of two pdf files looks
identically.

A possible solution for this tasks is provided by the LaTeX package pdfpagediff
[1]. However, it is a bit tedious to use, since it requires setting up and
compiling a LaTeX document.

I was wondering if a much more convenient solution could be implemented in
okular. From a user's perspective the workflow would look like this.

1. A pdf file is opened as usually.
2. There is menu button "Compare to..." which allows to select a second pdf
file.
3. The second file is displayed as an overlay onto the first file. 
   A slider allows the user to adjust the opacity of the second file.
   Panning and zooming works as expected.

Additionally, a command-line option allows to open two pdf files in such a
manner. 

-- 
[1] https://ctan.org/pkg/pdfpagediff

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