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To have 255 colors in the histograms, add the following to the root logon macro:
const Int_t NRGBs = 5; const Int_t NCont = 255; Double_t stops[NRGBs] = { 0.00, 0.34, 0.61, 0.84, 1.00 }; Double_t red[NRGBs] = { 0.00, 0.00, 0.87, 1.00, 0.51 }; Double_t green[NRGBs] = { 0.00, 0.81, 1.00, 0.20, 0.00 }; Double_t blue[NRGBs] = { 0.51, 1.00, 0.12, 0.00, 0.00 }; TColor::CreateGradientColorTable(NRGBs, stops, red, green, blue, NCont); gStyle->SetNumberContours(NCont);