Re: Grid-lines in "print" to png appear black always, not grey

[Tatsuro MATSUOKA]

>Octave 4.0.0
>>
>>code:
>>
>>    figure
>>    plot( 1:100 )
>>    grid on
>>    print( 'test.png', '-dpng ','-S500,500', '-color' )
>>
>>In https://engineeringliberty. wordpress.com/2011/10/07/ 
>>making-great-plots-in-octave- and-matlab-too/ 
>>
>>
>>I can see that the second graph down has an example of nice grey (as per the 
>>window) 
>>
>>
>>The figure looks like this in Octave
>>It prints to test.png like this
>>I have been through all the gca settings I can see, relevant. There's a LOT.
>>The printed plot respects none of them
>>
>>If anyone could help diagnose this it would be appreciated
>>
>>Tim


>Very sorry, correction - 
>Octave 4.2.1 (Win)
>


This is a limitation of openGL (qt and fltk) and -dpng printing devise.

For Octave 4.2.1 (Win), dpngcairo can be used on gnuplot graphics_toolkit.
Try 

graphics_toolkit gnuplot

figure
plot( 1:100 )
grid on
print( 'test.png', '-dpngcairo','-S500,500', '-color' )


Tatsuro