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Troubble with categorizing colors by RGB


Drakkhis
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Posted (edited)
<?php
include(dirname( __DIR__ ,1) . "/PDO_db_config.php");

function hexToRgb($hex) {
    $hex      = str_replace('#', '', $hex);
    $length   = strlen($hex);
    $r = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0));
    $g = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0));
    $b = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1), 2) : 0));
    return $r.",".$g.",".$b;
 }

function getcolorname($mycolor) {
    $colors = array(
        "black"     =>array(0,0,0),
        "green"     =>array(0,255,0),
        "blue"      =>array(0,0,255),
        "cyan"      =>array(0,255,255),
        "red"       =>array(255,0,0),
        "yellow"    =>array(255,255,0),
        "magenta"   =>array(255,0,255),
        "grey"      =>array(128,128,128),
        "white"     =>array(255,255,255)
    );

    $tmpdist = 765;
    $tmpname = "none";
    foreach($colors as $colorname => $colorset) {        
        $r_dist = (pow($mycolor[0],2) - pow($colorset[0],2));
        $g_dist = (pow($mycolor[1],2) - pow($colorset[1],2));       
        $b_dist = (pow($mycolor[2],2) - pow($colorset[2],2));
        $totaldist = sqrt($r_dist + $g_dist + $b_dist);
        if ($totaldist < $tmpdist) {        
            $tmpname = $colorname;
            $tmpdist = $totaldist;
        }
    }
    return $tmpname;
}

    $sql = $pdo->prepare("SELECT * FROM colors");
    $sql->execute();

    foreach ($sql as $data) 
    {
        $RGB = hexToRgb($data['HEX']);
        $arry = explode(',', $RGB);
        $DEC = "<".round(($arry[0]/255),3).",".round(($arry[1]/255),3).",".round(($arry[2]/255),3).">";
        $color = getcolorname($arry);
        $sql2 = $pdo->prepare("UPDATE `colors` SET `category` = :CAT, RGB = :RGB, LSL = :DEC WHERE (`color_ID` = :color_ID)");
        $sql2->bindValue(':CAT',  $color, PDO::PARAM_STR);
        $sql2->bindValue(':RGB',  $RGB, PDO::PARAM_STR);
        $sql2->bindValue(':DEC',  $DEC, PDO::PARAM_STR);
        $sql2->bindValue(':color_ID',  $data['color_ID'], PDO::PARAM_STR);
        $sql2->execute();
    }
echo "done";

I have a table of colors and I am trying to add color categories to each Color, but it is not categorizing correctly, any Help please.

Edited by Drakkhis
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  • Solution
Posted (edited)
<?php
include(dirname( __DIR__ ,1) . "/PDO_db_config.php");

function hexToRgb($hex) {
    $hex      = str_replace('#', '', $hex);
    $length   = strlen($hex);
    $r = hexdec($length == 6 ? substr($hex, 0, 2) : ($length == 3 ? str_repeat(substr($hex, 0, 1), 2) : 0));
    $g = hexdec($length == 6 ? substr($hex, 2, 2) : ($length == 3 ? str_repeat(substr($hex, 1, 1), 2) : 0));
    $b = hexdec($length == 6 ? substr($hex, 4, 2) : ($length == 3 ? str_repeat(substr($hex, 2, 1), 2) : 0));
    return $r.",".$g.",".$b;
 }

 function hexToHsl($hex) {
    $hex = str_replace('#', '', $hex);
    $hex = array($hex[0].$hex[1], $hex[2].$hex[3], $hex[4].$hex[5]);
    $rgb = array_map(function($part) {
        return hexdec($part) / 255;
    }, $hex);

    $max = max($rgb);
    $min = min($rgb);

    $l = ($max + $min) / 2;

    if ($max == $min) {
        $h = $s = 0;
    } else {
        $diff = $max - $min;
        $s = $l > 0.5 ? $diff / (2 - $max - $min) : $diff / ($max + $min);

        switch($max) {
            case $rgb[0]:
                $h = ($rgb[1] - $rgb[2]) / $diff + ($rgb[1] < $rgb[2] ? 6 : 0);
                break;
            case $rgb[1]:
                $h = ($rgb[2] - $rgb[0]) / $diff + 2;
                break;
            case $rgb[2]:
                $h = ($rgb[0] - $rgb[1]) / $diff + 4;
                break;
        }

        $h /= 6;
    }

    return array(floor($h*360), floor($s*100), floor($l*100));
}


function getcolorname($mycolor) {
    $colors = array(
        "magenta"   =>array(330,0,0),
        "blue"       =>array(270,0,0),
        "cyan"      =>array(210,0,0),
        "green"      =>array(150,0,0),
        "yellow"     =>array(90,0,0),
        "red"     =>array(30,0,0)
    );

    $tmpname = "red";
    foreach($colors as $colorname => $colorset) {        
        if ($mycolor[0] < $colorset[0]) $tmpname = $colorname;
        if ($mycolor[0] == 0 && $mycolor[1] == 0) $tmpname = "grey";
    }
    return $tmpname;
}

    $sql = $pdo->prepare("SELECT * FROM colors");
    $sql->execute();

    foreach ($sql as $data) 
    {
        $RGB = hexToRgb($data['HEX']);
        $arry = explode(',', $RGB);
        $DEC = "<".round(($arry[0]/255),3).",".round(($arry[1]/255),3).",".round(($arry[2]/255),3).">";
        $HSL = implode(',', hexToHsl($data['HEX']));
        $color = getcolorname(hexToHsl($data['HEX']));
        $sql2 = $pdo->prepare("UPDATE `colors` SET `category` = :CAT, RGB = :RGB, LSL = :DEC WHERE (`color_ID` = :color_ID)");
        $sql2->bindValue(':CAT',  $color, PDO::PARAM_STR);
        $sql2->bindValue(':RGB',  $RGB, PDO::PARAM_STR);
        $sql2->bindValue(':DEC',  $DEC, PDO::PARAM_STR);
        $sql2->bindValue(':color_ID',  $data['color_ID'], PDO::PARAM_STR);
        $sql2->execute();
    }
echo "done5";

It was not adding the correct color category to the color, But I switched to using HSL instead of RGB to categorize it and got it working

Edited by Drakkhis
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