i write the following in my rootlogon.C
{
cout << endl << "Welcome to rootlogon.C" << endl;
TStyle *picassoStyle = new TStyle("PICASSO", "PICASSO approved plots sytle");
picassoStyle->SetDrawBorder(0);
picassoStyle->SetCanvasColor(kWhite);
picassoStyle->SetCanvasDefH(400);
picassoStyle->SetCanvasDefW(600);
picassoStyle->SetCanvasBorderMode(0);
picassoStyle->SetPadBorderMode(0);
picassoStyle->SetPaintTextFormat("5.2f");
picassoStyle->SetLineWidth(2);
picassoStyle->SetTextSize(1.1);
picassoStyle->SetLabelSize(0.04,"xy");
picassoStyle->SetTitleSize(0.05,"xy");
picassoStyle->SetTitleOffset(1.0,"x");
picassoStyle->SetTitleOffset(1.6,"y");
picassoStyle->SetPadTopMargin(0.05);
picassoStyle->SetPadRightMargin(0.05);
picassoStyle->SetPadBottomMargin(0.15);
picassoStyle->SetPadLeftMargin(0.15);
picassoStyle->SetLegendBorderSize(1);
picassoStyle->SetFrameBorderMode(0);
picassoStyle->SetFrameFillColor(kWhite);
picassoStyle->SetTitleFillColor(kWhite);
picassoStyle->SetStatFontSize(0.03);
picassoStyle->SetStatBorderSize(1);
picassoStyle->SetStatFormat("6.4g");
picassoStyle->SetStatX(0.95);
picassoStyle->SetStatY(0.95);
picassoStyle->SetStatW(0.2);
picassoStyle->SetStatH(0.2);
picassoStyle->SetStatColor(kWhite);
picassoStyle->SetTitleX(0.3);
picassoStyle->SetTitleY(0.98);
picassoStyle->SetTitleBorderSize(1);
picassoStyle->SetTitleFontSize(0.06);
picassoStyle->SetLegendBorderSize(1);
gROOT->SetStyle("Plain");
TColor::InitializeColors();
const Int_t NRGBs = 5;
const Int_t NCont = 90;
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);
picassoStyle->SetNumberContours(NCont);
gROOT->SetStyle("PICASSO"); //uncomment to set this style
however, i am not able to take effect the RGB pallate for my 2D hist