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(PECL imagick 2, PECL imagick 3)
Imagick::getPixelRegionIterator — Get an ImagickPixelIterator for an image section
$x,$y,$columns,$rowsGet an ImagickPixelIterator for an image section.
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.
Returns an ImagickPixelIterator for an image section.
错误时抛出 ImagickException。
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");
?>
