(PECL imagick 2, PECL imagick 3)
Imagick::spliceImage — Splices a solid color into the image
public Imagick::spliceImage ( int $width , int $height , int $x , int $y ) : bool
Splices a solid color into the image.
width
height
x
y
 Returns true on success. 
Example #1 Imagick::spliceImage()
<?php
function spliceImage($imagePath, $startX, $startY, $width, $height) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->spliceImage($width, $height, $startX, $startY);
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?> 
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    https://www.php.net/manual/en/imagick.spliceimage.php