Re: octave w/ gnuplot backend produces bad pdf

[Daniel J S. <dan...@ie...>]

My observations after modifying some lines of your .gp file:

1) The pngcairo terminal appears to work with your example.  I see a 
black line for all segments and the colorbox is all black.  This is how 
it appears in the PNG file and Qt terminal.

2) The attached modification "fixes" the pdfcairo view problems.  What I 
did was add more levels to the colorbox so that grey and white are 
visible.  I then see one segment of the line in black and another 
segment of the line in white.  This is how it appears in the PDF file 
and Qt terminal.

So, it appears that there is either a Cairo bug or something is wrong in 
gnuplot (probably colorbar) when the number of color levels is 1.

Dan


On 05/31/2016 03:03 PM, Dmitri A. Sergatskov wrote:
> The following octave scrip produces a bad pdf
> (similar to one in https://bugzilla.redhat.com/show_bug.cgi?id=1340660 )
>
> graphics_toolkit ("gnuplot")
> x=linspace(-1,1,11);
> y=0;
> z=x;
> mesh(x,y,z);
> colormap([0,0,0]);
> print("bad_pdf.pdf", "-dpdfcairo")
>
> ====
>
> A gnuplot script tat demonstrates the problem is attached (it contains
> binary data).
>
> Both firefox and chrome would render pdf anyway, but evince/xpdf/okular
> would not.
>
> I suspect the problem with octave's
> colormap([0,0,0])
> command here.
> But I also think that gnuplot should not produce bad pdf.
>
> Dmitri.
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Dan Sebald
email: daniel(DOT)sebald(AT)ieee(DOT)org
URL: http://www(DOT)dansebald(DOT)com