Hi Alexandr, You must set the number of contours in your TH2. See your example below modified to generate 58 colors and the corresponding 58 contours. { const Int_t colNum = 58; TH2S *h = new TH2S("h", "h", 10, 1, colNum, 10, 1, colNum); Int_t palette[colNum]; for (Int_t i=0;i<colNum;i++) { TColor *color = new TColor(301+i, pow(i/((colNum)*1.0),0.3), pow(i/((colNum)*1.0),0.3), 0.5*(i/((colNum)*1.0)),""); palette[i] = 301+i; } h->SetMinimum(1); h->SetMaximum(colNum); h->SetContour(colNum); gStyle->SetPalette(colNum,palette); h->Draw("colz"); } Rene Brun On 29 Oct 2002, Alexandr Malusek wrote: > Hi, > > I have a problem with setting the number of palette colors when the > "colz" option is used with TH2. In the past, the following code set 32 > colors but now only 20 colors are displayed on the color bar. > > // A palette problem > { > const Int_t colNum = 32; > TH2S *h = new TH2S("h", "h", 10, 1, colNum, 10, 1, colNum); > > Int_t palette[colNum]; > for (Int_t i=0;i<colNum;i++) { > TColor *color = new TColor(301+i, > pow(i/((colNum)*1.0),0.3), > pow(i/((colNum)*1.0),0.3), > 0.5*(i/((colNum)*1.0)),""); > palette[i] = 301+i; > } > h->SetMinimum(1); > h->SetMaximum(colNum); > gStyle->SetPalette(colNum,palette); > h->Draw("colz"); > } > > I need 58 colors to distinguish tissues in some low resolution medical > images. How can I do it? > > -- > Alexandr.Malusek@imv.liu.se >
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