[Octave-bug-tracker] [bug #48689] print to pdf shows black and yellow shaded regions not present on screen on macOS

[Vic Norton]

Follow-up Comment #11, bug #48689 (project octave):

Observations based on the images in file #38126
0. All images were produced on a Mac OS X 10.11 system.
1. There are two graphical systems represented by these images.
  a. graphics_toolkit gnuplot; setenv GNUTERM qt;
  b. graphics_toolkit qt;
2. Both systems can save graphical PGF output with the print
   function, e.g.,
     print sergX.pdf;
   but system "a" can also "export" graphical output from its
   "gnuplot-qt" window.
3. Of the three ways to produce and save graphical output from an
   octave script to a PDF file,
     gnuqt-export, gnuqt-print, qt-print,
   only the first way creates an exact representation of the screen
   image on my Macintosh screen.
4. The most serious problem illustrated by Dmitri Sergatskov's
   "simplified test" is seen by comparing
     sergA_qt_screen.pdf  and  sergA_qt_print.pdf.
   The print image is an ugly distortion of the screen image.
   On the other hand, if one backs away a bit, as in
     sergB_qt_screen.pdf  and  sergB_qt_print.pdf,
   the print image is a more accurate representation of the code.


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