Returns a MagickPixelIterator

# Imagick::getPixelIterator

(PECL imagick 2, PECL imagick 3)

Imagick::getPixelIterator — Returns a MagickPixelIterator

### 说明

public function Imagick::getPixelIterator(): ImagickPixelIterator

Returns a MagickPixelIterator.

### 参数

此函数没有参数。

### 返回值

Returns an ImagickPixelIterator on success.

### 错误／异常

错误时抛出 ImagickException。

### 示例

示例 #1 Imagick::getPixelIterator()

    <?php
    function getPixelIterator($imagePath) {
        $imagick = new \Imagick(realpath($imagePath));
        $imageIterator = $imagick->getPixelIterator();

        foreach ($imageIterator as $row => $pixels) { /* Loop through pixel rows */
            foreach ($pixels as $column => $pixel) { /* Loop through the pixels in the row (columns) */
                /** @var $pixel \ImagickPixel */
                if ($column % 2) {
                    $pixel->setColor("rgba(0, 0, 0, 0)"); /* Paint every second pixel black*/
                }
            }
            $imageIterator->syncIterator(); /* Sync the iterator, this is important to do on each iteration */
        }

        header("Content-Type: image/jpg");
        echo $imagick;
    }

    ?>

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