Re: [Gnuplot-py-users] No monochrome png and title-offset

[Ole C. W. <ole...@ae...>]

Hi Daniel,

I think it's impossible to create monochrome png images just by adding 
the "monochrome" option, because the "png"-terminal does not support it, 
unlike the "postscript"-terminal. It's not gnuplot.py's fault ;-)

gnuplot> help set terminal postscript
 Several options may be set in the `postscript` driver.

 Syntax:
       set terminal postscript {<mode>} {enhanced | noenhanced}
                               {color | colour | monochrome}
                               {blacktext | colortext | colourtext}
                               {solid | dashed} {dashlength | dl <DL>}
                               {linewidth | lw <LW>}
                               {<duplexing>}
                               {rounded | butt}
                               {fontfile [add | delete] "<filename>"}
                               {palfuncparam <samples>{,<maxdeviation>}}
                               {"<fontname>"} {<fontsize>}

gnuplot> help set terminal png
 Syntax:
       set terminal png
              {{no}transparent} {{no}interlace}
              {tiny | small | medium | large | giant}
              {font <face> {<pointsize>}}
              {size <x>,<y>} {{no}crop}
              {{no}enhanced}
              {<color0> <color1> <color2> ...}

The only way to create a monochrome png is to define your own monochrome 
palette with the png-terminal's color options. Here's an example from 
the gnuplot help:

       set terminal png medium size 640,480 \
                        xffffff x000000 x404040 \
                        xff0000 xffa500 x66cdaa xcdb5cd \
                        xadd8e6 x0000ff xdda0dd x9500d3    # defaults

 which uses white for the non-transparent background, black for borders, 
gray
 for the axes, and red, orange, medium aquamarine, thistle 3, light 
blue, blue,
 plum and dark violet for eight plotting colors.

Cheers,

Ole


da...@we... wrote:
> Hi,
>
> I am running gnuplot 4.0 and it seems to be imposible to create an monochrome 
> png:
> this line:
>
> g.hardcopy("somename.png", terminal='png', monochrome= 1)
>
> gives me:
>
> gnuplot> set terminal png monochrome
>                           ^
>          line 0: invalid color spec, must be xRRGGBB
>
> Furthermore I would like to know how I can move the description line (the 
> title) for a plot like this:
> g.plot(Gnuplot.Data(tmp1, title = "C^1_{t}", with="lines"))
>
> this:
> g.plot(Gnuplot.Data(tmp1, title = "C^1_{t}", with="lines", offset = (1,1))
> does not work for me.
>
> Thank you very much,
>
> Daniel
>
>
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