ImagickPixel::isSimilar

(PECL imagick 2.0.0)

ImagickPixel::isSimilar — Check the distance between this color and another

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ImagickPixel::isSimilar ( ImagickPixel $color , float $fuzz ) : bool
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Checks the distance between the color described by this ImagickPixel object and that of the provided object, by plotting their RGB values on the color cube. If the distance between the two points is less than the fuzz value given, the colors are similar. Deprecated in favour of ImagickPixel::isPixelSimilar().

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color

The ImagickPixel object to compare this object against.

fuzz

The maximum distance within which to consider these colors as similar. The theoretical maximum for this value is the square root of three (1.732).

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Example #1 ImagickPixel::isSimilar()

<?php
        // The tests below are written with the maximum distance expressed as 255
        // so we need to scale them by the square root of 3 - the diagonal length
        // of a unit cube.
        $root3 = 1.732050807568877;

        $tests = array(
            ['rgb(245, 0, 0)',      'rgb(255, 0, 0)',   9 / $root3,         false,],
            ['rgb(245, 0, 0)',      'rgb(255, 0, 0)',  10 / $root3,         true,],
            ['rgb(0, 0, 0)',        'rgb(7, 7, 0)',     9 / $root3,         false,],
            ['rgb(0, 0, 0)',        'rgb(7, 7, 0)',    10 / $root3,         true,],
            ['rgba(0, 0, 0, 1)',    'rgba(7, 7, 0, 1)', 9 / $root3,         false,],
            ['rgba(0, 0, 0, 1)',    'rgba(7, 7, 0, 1)',    10 / $root3,     true,],
            ['rgb(128, 128, 128)',  'rgb(128, 128, 120)',   7 / $root3,     false,],
            ['rgb(128, 128, 128)',  'rgb(128, 128, 120)',   8 / $root3,     true,],
            ['rgb(0, 0, 0)',        'rgb(255, 255, 255)',   254.9,          false,],
            ['rgb(0, 0, 0)',        'rgb(255, 255, 255)',   255,            true,],
            ['rgb(255, 0, 0)',      'rgb(0, 255, 255)',     254.9,          false,],
            ['rgb(255, 0, 0)',      'rgb(0, 255, 255)',     255,            true,],
            ['black',               'rgba(0, 0, 0)',        0.0,            true],
            ['black',               'rgba(10, 0, 0, 1.0)',  10.0 / $root3,  true],);

        $output = "<table width='100%' class='infoTable'><thead>
                <tr>
                <th>
                Color 1
                </th>
                <th>
                Color 2
                </th>
                <th>
                    Test distance * 255
                </th>
                <th>
                    Is within distance
                </th>
                </tr>
        </thead>";

        $output .= "<tbody>";

        foreach ($tests as $testInfo) {
            $color1 = $testInfo[0];
            $color2 = $testInfo[1];
            $distance = $testInfo[2];
            $expectation = $testInfo[3];
            $testDistance = ($distance / 255.0);

            $color1Pixel = new \ImagickPixel($color1);
            $color2Pixel = new \ImagickPixel($color2);

            $isSimilar = $color1Pixel->isPixelSimilar($color2Pixel, $testDistance);


            if ($isSimilar !== $expectation) {
                echo "Test distance failed. Color [$color1] compared to color [$color2] is not within distance $testDistance FAILED.".NL;
            }

            $layout = "<tr>
                <td>%s</td>
                <td>%s</td>
                <td>%s</td>
                <td style='text-align: center;'>%s</td>
            </tr>";
            
            $output .= sprintf(
                $layout,
                $color1,
                $color2,
                $distance,
                $isSimilar ? 'yes' : 'no'
            );
        }

        $output .= "</tbody></table>";
        
        return $output;

?>