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Calculate difference in percentage between 2 hex colors. Port from Javascript to PHP. For calculating the perception difference, may would be better https://github.com/renasboy/php-color-difference
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| function color_meter(cwith, ccolor) { | |
| if (!cwith && !ccolor) return; | |
| var _cwith = (cwith.charAt(0)=="#") ? cwith.substring(1,7) : cwith; | |
| var _ccolor = (ccolor.charAt(0)=="#") ? ccolor.substring(1,7) : ccolor; | |
| var _r = parseInt(_cwith.substring(0,2), 16); | |
| var _g = parseInt(_cwith.substring(2,4), 16); | |
| var _b = parseInt(_cwith.substring(4,6), 16); | |
| var __r = parseInt(_ccolor.substring(0,2), 16); | |
| var __g = parseInt(_ccolor.substring(2,4), 16); | |
| var __b = parseInt(_ccolor.substring(4,6), 16); | |
| var p1 = (_r / 255) * 100; | |
| var p2 = (_g / 255) * 100; | |
| var p3 = (_b / 255) * 100; | |
| var perc1 = Math.round((p1 + p2 + p3) / 3); | |
| var p1 = (__r / 255) * 100; | |
| var p2 = (__g / 255) * 100; | |
| var p3 = (__b / 255) * 100; | |
| var perc2 = Math.round((p1 + p2 + p3) / 3); | |
| return Math.abs(perc1 - perc2); | |
| } |
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