Php/docs/imagick.getpixelregioniterator
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 $rows
) : ImagickPixelIterator
Get an ImagickPixelIterator for an image section.
参数
x- The x-coordinate of the region.
y- The y-coordinate of the region.
columns- The width of the region.
rows- The height of the region.
返回值
Returns an ImagickPixelIterator for an image section.
错误／异常
错误时抛出 ImagickException。
范例
Example #1 Imagick::getPixelRegionIterator() example
Iterate over the pixels in the top left of the image, changing them to be black.
<?php$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");?>
