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    ImagickKernel::scale

    (PECL imagick >= 3.3.0)

    ImagickKernel::scale — Scales a kernel list by the given amount

    説明

    public ImagickKernel::scale(float $scale, int $normalizeFlag = ?): void

    Scales the given kernel list by the given amount, with or without normalization of the sum of the kernel values (as per given flags). The exact behaviour of this function depends on the normalization type being used please see http://www.imagemagick.org/api/morphology.php#ScaleKernelInfo for details.

    パラメータ

    scale

    normalizeFlag

    • Imagick::NORMALIZE_KERNEL_NONE
    • Imagick::NORMALIZE_KERNEL_VALUE
    • Imagick::NORMALIZE_KERNEL_CORRELATE
    • Imagick::NORMALIZE_KERNEL_PERCENT

    戻り値

    例

    例1 ImagickKernel::scale()

    <?php


    function renderKernelTable($matrix) {
    $output = "<table class='infoTable'>";

    foreach (    $matrix as $row) {
    $output .= "<tr>";
    foreach (    $row as $cell) {
    $output .= "<td style='text-align:left'>";
    if (    $cell === false) {
    $output .= "false";
    }
    else {
    $output .= round($cell, 3);
    }
    $output .= "</td>";
    }
    $output .= "</tr>";
    }

    $output .= "</table>";

    return     $output;
    }


    $output = "";

    $matrix = [
    [-    1, 0, -1],
    [     0, 4, 0],
    [-    1, 0, -1],
    ];

    $kernel = \ImagickKernel::fromMatrix($matrix);
    $kernelClone = clone $kernel;

    $output .= "Start kernel<br/>";
    $output .= renderKernelTable($kernel->getMatrix());


    $output .= "Scaling with NORMALIZE_KERNEL_VALUE. The <br/>";
    $kernel->scale(2, \Imagick::NORMALIZE_KERNEL_VALUE);
    $output .= renderKernelTable($kernel->getMatrix());


    $kernel = clone $kernelClone;
    $output .= "Scaling by percent<br/>";
    $kernel->scale(2, \Imagick::NORMALIZE_KERNEL_PERCENT);
    $output .= renderKernelTable($kernel->getMatrix());

    $matrix2 = [
    [-    1, -1, 1],
    [ -    1, false, 1],
    [    1, 1, 1],
    ];

    $kernel = \ImagickKernel::fromMatrix($matrix2);
    $output .= "Scaling by correlate<br/>";
    $kernel->scale(1, \Imagick::NORMALIZE_KERNEL_CORRELATE);
    $output .= renderKernelTable($kernel->getMatrix());

    return     $output;
    ?>

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