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  • Imagick::getPixelRegionIterator()

    (PECL imagick 2.0.0)

    Get an ImagickPixelIterator for an image section

    说明

    Imagick::getPixelRegionIterator(int $x,int $y,int $columns,int $rows): ImagickPixelIterator

    Get an ImagickPixelIterator for an image section.

    参数

    $x

    The x-coordinate of the region.

    $y

    The y-coordinate of the region.

    $columns

    The width of the region.

    $rows

    The height of the region.

    返回值

    Returns an ImagickPixelIterator for an image section.

    错误/异常

    错误时抛出 ImagickException。

    范例

    Example #1 Imagick::getPixelRegionIterator() example

    Iterate over the pixels in the top left of the image, changing them to be black.

    <?php
    $im = new Imagick(realpath("./testImage.png"));
    $areaIterator = $im->getPixelRegionIterator(0, 0, 10, 10);
    foreach ($areaIterator as $rowIterator) {
        foreach ($rowIterator as $pixel) {
            // Paint every pixel black
            $pixel->setColor("rgba(0, 0, 0, 0)");
        }
        $areaIterator->syncIterator();
    }
    $im->writeImage("./output.png");
    ?>