Re: gnuplot graphics toolkit bugs

[Daniel J Sebald]

On 06/23/2015 08:58 AM, Ben Abbott wrote:
> > On Jun 23, 2015, at 2:52 AM, Daniel J Sebald<address@hidden>

[snip]

> > https://savannah.gnu.org/bugs/?func=detailitem&item_id=43907
> > bug #43907: OpenGL render code called even when gnuplot is graphics_toolkit
> >
> > Dan
>
> Perhaps the most serious gnuplot 5 related bug is below. I’ve attached a patch 
> to the bug report, but since I’m not able to build Octave 4.x on Mac OSX, I 
> haven’t pushed it.
>
>         http://savannah.gnu.org/bugs/?42838
>
> Ben

Well, there is a lot there for me to read, but let me just guess that 
this is the issue where default EPS mode uses grayscale, not color.  And 
in gnuplot, the grayscale mode translates any non-white color to black, 
technically monochrome.

I had addressed this somewhat in the changeset:

https://savannah.gnu.org/bugs/?44187
bug #44187: Bugs and modifications in print() with gnuplot graphics toolkit

by either not plotting the color background or using color terminal but 
casting all colors to a grayscale equivalent.  But then I thought that 
was too much for one bug report and pulled back so that the black 
color-background-translates-to-black issue is still present.

My thinking was that perhaps I could get gnuplot to add a "grayscale" 
option in addition to "color" and "monotone".  I didn't get much 
traction on that, but I could pursue it again.  Looks like you've been 
working on it for some time, so if you have a good solution, that should 
do in lieu of a new gnuplot feature.

Dan