IAC LeadTunstateCherenkovCrystalTests 2-15

2/17/15

Beam profile measurements using glass plates separated by 40.4 cm

The Image2Hist.C program from the ROOT tutorials

//Create a 2-D histogram from an image.
//Author: Olivier Couet

void image2hist()
{
  //   TASImage image("rose512.jpg");
   TASImage image("test.png");
   UInt_t yPixels = image.GetHeight();
   UInt_t xPixels = image.GetWidth();
   UInt_t *argb   = image.GetArgbArray();

   TH2D* BeamShape = new TH2D("BeamShape","BeamShape",xPixels,-1,1,yPixels,-1,1);

   for (int row=0; row<xPixels; ++row) {
      for (int col=0; col<yPixels; ++col) {
         int index = col*xPixels+row;
         float grey = float(argb[index]&0xff)/256;
         BeamShape->SetBinContent(row+1,yPixels-col,grey);
      }
   }

   gStyle->SetPalette(53);
   BeamShape->Draw("colz");
}

IAC_Experiments