@onesy/utils
Version:
21 lines (20 loc) • 842 B
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const is_1 = __importDefault(require("./is"));
const colorToRgb_1 = __importDefault(require("./colorToRgb"));
const getLuminance = (value) => {
let values = (0, colorToRgb_1.default)(value, undefined, true);
if ((0, is_1.default)('array', values) && values.length >= 3) {
values = values.slice(0, 3).map(item => {
// Normalize
item /= 255;
return item <= 0.03928 ? item / 12.92 : ((item + 0.055) / 1.055) ** 2.4;
});
const [r, g, b] = values;
return Number((r * 0.2126 + g * 0.7152 + b * 0.0722).toFixed(2));
}
};
exports.default = getLuminance;