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-de...@kde.org
Reporter: nuntiu...@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.
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[1] https://ctan.org/pkg/pdfpagediff
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