{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?
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Jeffrey G Reid | jgreid@u.washington.edu | UW Nuclear Physics Lab
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