37     cout << "lutgen -d SIZE -s SOURCE -t TARGET <lut file>" << endl;  in printHelp()
38     cout << endl;  in printHelp()
39     cout << "Generate a 3D LUT to convert between two color spaces." << endl;  in printHelp()
40     cout << endl;  in printHelp()
41     cout << "If <lut file> ends in .inc, data is generated without the array declaration." << endl;  in printHelp()
42     cout << endl;  in printHelp()
43     cout << "Options:" << endl;  in printHelp()
44     cout << "  --help, -h" << endl;  in printHelp()
45     cout << "    print this message" << endl;  in printHelp()
46     cout << "  --dimension=, -d" << endl;  in printHelp()
47 …  cout << "    the dimension of the 3D LUT. Example: 17 for a 17x17x17 LUT. 32 by default" << endl;  in printHelp()
48     cout << "  --source=COLORSPACE, -s" << endl;  in printHelp()
49 … cout << "    the source color space, see below for available names. DisplayP3 by default" << endl;  in printHelp()
50     cout << "  --target=COLORSPACE, -t" << endl;  in printHelp()
51 …ut << "    the target color space, see below for available names. extendedSRGB by default" << endl;  in printHelp()
52     cout << endl;  in printHelp()
53     cout << "Colorspace names:" << endl;  in printHelp()
54     cout << "    sRGB" << endl;  in printHelp()
55     cout << "    linearSRGB" << endl;  in printHelp()
56     cout << "    extendedSRGB" << endl;  in printHelp()
57     cout << "    linearExtendedSRGB" << endl;  in printHelp()
58     cout << "    NTSC" << endl;  in printHelp()
59     cout << "    BT709" << endl;  in printHelp()
60     cout << "    BT2020" << endl;  in printHelp()
61     cout << "    AdobeRGB" << endl;  in printHelp()
62     cout << "    ProPhotoRGB" << endl;  in printHelp()
63     cout << "    DisplayP3" << endl;  in printHelp()
64     cout << "    DCIP3" << endl;  in printHelp()
65     cout << "    ACES" << endl;  in printHelp()
66     cout << "    ACEScg" << endl;  in printHelp()
147         outputStream << "// generated with lutgen " << filename.c_str() << endl;  in main()
148         outputStream << "// 3D LUT stored as an RGB16F texture, in GL order" << endl;  in main()
149         outputStream << "// Size is " << gSize << "x" << gSize << "x" << gSize << endl;  in main()
158 …        outputStream << "const size_t LUT_" << src << "_TO_" << dst << "_SIZE = " << gSize << endl;  in main()
161             outputStream << "// From " << src << " to " << dst << endl;  in main()
167                     if (x % 4 == 0) outputStream << endl << "    ";  in main()
183             outputStream << endl << "}; // end LUT" << endl;  in main()
186         outputStream << endl;  in main()
190         cerr << "Could not write to file: " << filename << endl;  in main()