Imagick::getPixelRegionIterator

(PECL imagick 2, PECL imagick 3)

Imagick::getPixelRegionIterator — Get an ImagickPixelIterator for an image section

说明

public 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。

示例

示例 #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");
?>

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