Rene Brun
Jeffrey Reid wrote:
>
> {using ROOT_LEVEL : 2.22.06}
>
> I have a 2d histogram that I want to plot using a "pretty spectrum". In
> the documentation for SetPalette it says:
>
> if ncolors == 1 && colors == 0, then
> a Pretty Palette with a Spectrum Violet->Red is created.
> It is recommended to use this Pretty palette when drawing legos,
> surfaces or contours.
>
> So I setup a new style [myStyle], set the palette to the "pretty
> spectrum" and then set the current style to myStyle:
>
> TStyle *myStyle = new TStyle("myStyle","my style");
> myStyle->SetPalette(1,0);
> myStyle->cd();
>
> Now I plot my 2d histogram using "colz":
>
> MyHistogram.Draw("colz");
>
> The problem is that the palette I get is not the "pretty spectrum" I
> expect, instead I get only 1 color (light grey). It seems to me that
> this SetPalette(1,0) isn't being treated as a special case, it is just
> giving me a grey gradient with 1 color (if I go to SetPalette(2,0) I get
> two shades of grey in the gradient, as I would expect).
>
> How can I get the pretty violet->red spectrum that I crave so badly?
>
> ---------------------------------------------------------------------
> Jeffrey G Reid | jgreid@u.washington.edu | UW Nuclear Physics Lab
> =====================================================================