[Octave-bug-tracker] [bug #55486] imread imports PDF(paper) images with low 75dpi(screen) resolution

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?55486>

                 Summary: imread imports PDF(paper) images with low
75dpi(screen) resolution
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 16 Jan 2019 04:48:33 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Hale
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Microsoft Windows

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Details:

imread() does not have an option for setting vector data interpreter
resolution.

One would expect a standard (traditional) resolution to be used depending on
the source data type.
I.e. .svg is a web/screen vector data, while .PS, .PDF are formats purely for
printable data.
Classic (but outdated) screen resolution is 75dpi.
And for printable data it was always between 300dpi for color, and 400-600 dpi
for B/W.

But for some weird and insane reason imread() (__magick_read__ actually) uses
75 dpi for printable PDF sources.

This often makes imported data unusable.

And there is no documentation on __magick_read__ for hacking __imread__() .m
code (if it is possible at all)




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