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"source": [
"# accessiblecolorschemes\n",
"Factors like colorblindness and converting colors to grayscale for publications\n",
"can impact accessibility. Furthermore, results should be aesthetically pleasing. The following\n",
"three color schemes, recommended by M. Petroff in [arXiv:2107.02270v2](https://arxiv.org/pdf/2107.02270)\n",
"and available on [GitHub](https://github.com/mpetroff/accessible-color-cycles)\n",
"under the MIT License, meet these criteria.\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Olivier Couet \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:36 PM."
]
},
{
"cell_type": "markdown",
"id": "1b433485",
"metadata": {},
"source": [
" Definition of a helper function: "
]
},
{
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"id": "72715de4",
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"source": [
"%%cpp -d\n",
"\n",
"void box(double x1, double y1, double x2, double y2, int col)\n",
"{\n",
" auto b1 = new TBox(x1, y1, x2, y2);\n",
" b1->SetFillColor(col);\n",
" b1->Draw();\n",
"\n",
" TColor *c = gROOT->GetColor(col);\n",
" auto tc = new TLatex((x2 + x1) / 2., 0.01 + (y2 + y1) / 2., Form(\"#splitline{%s}{%s}\", c->GetName(), c->GetTitle()));\n",
" tc->SetTextFont(42);\n",
" tc->SetTextAlign(23);\n",
" tc->SetTextSize(0.020);\n",
" tc->Draw();\n",
"}"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "005b6466",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:36:42.845259Z",
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"outputs": [],
"source": [
"auto C = new TCanvas(\"C\", \"C\", 600, 800);\n",
"int c;\n",
"double x, y;\n",
"double w = 0.2;\n",
"double h = 0.08;\n",
"auto t = new TText();\n",
"t->SetTextSize(0.025);\n",
"t->SetTextFont(42);"
]
},
{
"cell_type": "markdown",
"id": "b2ef8220",
"metadata": {},
"source": [
"6-colors scheme"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "e417e2d7",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:36:43.201939Z",
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"shell.execute_reply": "2026-05-19T20:36:43.403315Z"
}
},
"outputs": [],
"source": [
"x = 0.1;\n",
"y = 0.1;\n",
"t->DrawText(x, y - h / 2., \"6-colors scheme\");\n",
"for (c = kP6Blue; c < kP6Blue + 6; c++) {\n",
" box(x, y, x + w, y + h, c);\n",
" y = y + h;\n",
"}"
]
},
{
"cell_type": "markdown",
"id": "cdc483fd",
"metadata": {},
"source": [
"8-color scheme"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "4bc704c4",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:36:43.405901Z",
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"shell.execute_reply": "2026-05-19T20:36:43.607153Z"
}
},
"outputs": [],
"source": [
"y = 0.1;\n",
"x = 0.4;\n",
"t->DrawText(x, y - h / 2., \"8-colors scheme\");\n",
"for (c = kP8Blue; c < kP8Blue + 8; c++) {\n",
" box(x, y, x + w, y + h, c);\n",
" y = y + h;\n",
"}"
]
},
{
"cell_type": "markdown",
"id": "7d941060",
"metadata": {},
"source": [
"10-color scheme"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "e9c9d1d5",
"metadata": {
"collapsed": false,
"execution": {
"iopub.execute_input": "2026-05-19T20:36:43.621300Z",
"iopub.status.busy": "2026-05-19T20:36:43.621156Z",
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"shell.execute_reply": "2026-05-19T20:36:43.833649Z"
}
},
"outputs": [],
"source": [
"y = 0.1;\n",
"x = 0.7;\n",
"t->DrawText(x, y - h / 2., \"10-colors scheme\");\n",
"for (c = kP10Blue; c < kP10Blue + 10; c++) {\n",
" box(x, y, x + w, y + h, c);\n",
" y = y + h;\n",
"}"
]
},
{
"cell_type": "markdown",
"id": "10a05bbb",
"metadata": {},
"source": [
"Draw all canvases "
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "473491f7",
"metadata": {
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