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"); ?>