Imagick::getPixelRegionIterator
(PECL imagick 2.0.0)
Imagick::getPixelRegionIterator — 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");
?>
