{
"cells": [
{
"cell_type": "markdown",
"id": "90f90e0a",
"metadata": {},
"source": [
"# hist2image\n",
"Create an image from a 2-D histogram and manipulate it.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Valeriy Onuchin \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:38 PM."
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "a7a27f38",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:37.557446Z",
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"shell.execute_reply": "2026-05-19T20:38:37.909552Z"
}
},
"outputs": [],
"source": [
"TCanvas *canv = new TCanvas(\"image\", \"xygaus + xygaus(5) + xylandau(10)\");\n",
"canv->ToggleEventStatus();\n",
"canv->SetRightMargin(0.2);\n",
"canv->SetLeftMargin(0.01);\n",
"canv->SetTopMargin(0.01);\n",
"canv->SetBottomMargin(0.01);"
]
},
{
"cell_type": "markdown",
"id": "34f27ea0",
"metadata": {},
"source": [
"histogram as image (hist taken from draw2dopt.C)"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "68bd4d12",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:38:37.912196Z",
"iopub.status.busy": "2026-05-19T20:38:37.912073Z",
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"shell.execute_reply": "2026-05-19T20:38:38.123598Z"
}
},
"outputs": [],
"source": [
"TImage *img = TImage::Create();\n",
"\n",
"TF2 *f2 = new TF2(\"f2\", \"(xygaus + xygaus(5) + xylandau(10))\", -4, 4, -4, 4);\n",
"Double_t params[] = {130, -1.4, 1.8, 1.5, 1, 150, 2, 0.5, -2, 0.5, 3600, -2, 0.7, -3, 0.3};\n",
"f2->SetParameters(params);\n",
"TH2D *h2 = new TH2D(\"h2\", \"xygaus + xygaus(5) + xylandau(10)\", 100, -4, 4, 100, -4, 4);\n",
"h2->FillRandom(\"f2\", 40000);\n",
"img->SetImage((const Double_t *)h2->GetArray(), h2->GetNbinsX() + 2, h2->GetNbinsY() + 2, gHistImagePalette);\n",
"img->Draw();"
]
},
{
"cell_type": "markdown",
"id": "f1b6d1b5",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "7e97df9a",
"metadata": {
"collapsed": false,
"execution": {
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"shell.execute_reply": "2026-05-19T20:38:38.347827Z"
}
},
"outputs": [
{
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},
"metadata": {},
"output_type": "display_data"
}
],
"source": [
"gROOT->GetListOfCanvases()->Draw()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "ROOT C++",
"language": "c++",
"name": "root"
},
"language_info": {
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