File indexing completed on 2024-05-19 05:34:08
0001 /* 0002 SPDX-FileCopyrightText: 2018 Michail Vourlakos <mvourlakos@gmail.com> 0003 SPDX-License-Identifier: GPL-2.0-or-later 0004 */ 0005 0006 function colorBrightness(color) { 0007 return colorBrightnessFromRGB(color.r * 255, color.g * 255, color.b * 255); 0008 } 0009 0010 // formula for brightness according to: 0011 // https://www.w3.org/TR/AERT/#color-contrast 0012 function colorBrightnessFromRGB(r, g, b) { 0013 return (r * 299 + g * 587 + b * 114) / 1000 0014 } 0015 0016 function colorLuminas(color) { 0017 return colorLuminasFromRGB(color.r, color.g, color.b) 0018 } 0019 0020 // formula for luminance according to: 0021 // https://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef 0022 function colorLuminasFromRGB(r, g, b) { 0023 var rS = (r <= 0.03928) ? ( r / 12.92) : Math.pow( ((r + 0.055) / 1.055), 2.4 ); 0024 var gS = (g <= 0.03928) ? ( g / 12.92) : Math.pow( ((g + 0.055) / 1.055), 2.4 ); 0025 var bS = (b <= 0.03928) ? ( b / 12.92) : Math.pow( ((b + 0.055) / 1.055), 2.4 ); 0026 0027 return 0.2126*rS + 0.7152*gS + 0.0722*bS; 0028 }