This function only support JPEG file.
https://github.com/Imagick/imagick/issues/124#issuecomment-226942140
(PECL imagick 2, PECL imagick 3)
Imagick::commentImage — Adds a comment to your image
commentThe comment to add
成功时返回 true。
错误时抛出 ImagickException。
示例 #1 Using Imagick::commentImage():
Commenting an image and retrieving the comment:
<?php
/* Create new Imagick object */
$im = new imagick();
/* Create an empty image */
$im->newImage(100, 100, new ImagickPixel("red"));
/* Add comment to the image */
$im->commentImage("Hello World!");
/* Display the comment */
echo $im->getImageProperty("comment");
?>This function only support JPEG file.
https://github.com/Imagick/imagick/issues/124#issuecomment-226942140