hsumanim.C: This script is a slightly modified version of hsum.C. | Image Processing | img2pad.C: Display image in canvas and pad. |
//Create a 2-D histogram from an image. //Author: Olivier Couet void image2hist() { TASImage image("rose512.jpg"); UInt_t yPixels = image.GetHeight(); UInt_t xPixels = image.GetWidth(); UInt_t *argb = image.GetArgbArray(); TH2D* h = new TH2D("h","Rose histogram",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; h->SetBinContent(row+1,yPixels-col,grey); } } gStyle->SetPalette(53); h->Draw("colz"); }