Re: pm3dcolors demo broken

[Tatsuro M. <tma...@ya...>]

----- Original Message -----

> From: Tatsuro MATSUOKA
> To: Merritt Ethan ; gnuplot-beta
> Cc: 
> Date: 2015/7/2, Thu 15:34
> Subject: Re: pm3dcolors demo broken
> 
> ----- Original Message -----
> 
>>  From: sfeam 
>>  To: gnuplot-betat
>>  Cc: tmacchant 
>>  Date: 2015/7/2, Thu 15:09
>>  Subject: Re: pm3dcolors demo broken
>> 
>>  On Wednesday, 01 July 2015 10:24:49 PM tmacchant wrote:
>>>   In the last post I have generated the plot in wxt terminal.
>>>   That worked correctly
>>> 
>>>   However, as in written web site I have re-generate it using 
>>> 
>>>   set terminal png transparent nocrop enhanced size 450,320 font 
>>  "arial,8"
>>>   set output 'pm3dcolors.1.png' 
>>>   load 
> 'C:\Programs\gp510-64\demo\pm3dcolors.dem'
>>>   set output 
>>>    
>>>   <http://gnuplot.10905.n7.nabble.com/file/n19585/pm3dcolors.png> 
>>> 
>>>   This is the same as on the web site.
>>> 
>>>   Is this a png terminal bug?
>> 
>>  The web site is generated using the pngcairo terminal.
>> 
>>  The png (libgd) terminal by default creates a file with 
>>  indexed colors, 245 colors maximum.  This is not enough
>>  to create multiple smooth palettes.  To create files with
>>  full 24-bit RGB color you must say
>> 
>>  set term png truecolor ...
>> 
>>>   Is this better to be filed into bug ticket?
>>>     Tatsuro
>> 
>>  I do not think there is a bug here.
>> 
>>      Ethan
> Ok. I have confirmed that truecolor option resolve the issue on png terminal.
> And it is not a bug.
> 
>>  The web site is generated using the pngcairo terminal.
> 
> 
> I have believed so but 
> 
> In the page
> http://gnuplot.sourceforge.net/demo/pm3dcolors.html
> 
> 
> Click herefor minimal script to generate this plot
> 
> 
> And clicked here.
> 
> 
> There described.
> # set terminal png transparent nocrop enhanced size 450,320 font 
> "arial,8" 
> # set output 'pm3dcolors.1.png'
> g(x)=x
> GPFUN_g = "g(x)=x"
> splot g(x)
> 
> So I tried to generate the plot by 
> set terminal png transparent nocrop enhanced size 450,320 font 
> "arial,8" 
> set output 'pm3dcolors.1.png' 
> 
> The image downloaded from the web site and generated the above setting using 
> gnuplot 5.1
> is almost the same.
> 
> As far as this image, the image created by png terminal with the above option 
> but not pngcairo terminal.
> 
> Anyway the page should be revised.
> Tatsuro
> 
I have confirmed that the page
http://gnuplot.sourceforge.net/demo/pm3dcolors.html

is updated with pngcairo.

Thanks!

Tatsuro