center crop with gravity using Imagick and PHP - php

Question

I'm looking to center crop and image using Imagick PHP apis (not command line version of Imagick).
Essentially I want to do what is possible via command line, using API. Here is an example via command line:
http://www.imagemagick.org/Usage/crop/#crop_gravity
Here is what I'm doing (not working). It always crops the upper left corner of the source:
$this->imagickObj->setGravity(\Imagick::GRAVITY_CENTER);
$this->imagickObj->cropImage(300,250,0,0);
$this->imagickObj->setImagePage(0, 0, 0, 0);
Why is the setGravity not applying to the image before the crop? http://www.php.net/manual/en/function.imagick-setgravity.php says it should apply to the object (in this case the single image)...

Answer 1

Its too late for the original person who asked the question but for future visitors, correct solution is
bool Imagick::cropThumbnailImage ( int $width , int $height )
Sorry for late reply but I too stuck here just 30 mins ago and first google result redirected me here. Hope same will not happen with others.

Answer 2

Looks like there is not support, here is how I ended up doing it:
https://gist.github.com/1364489

Answer 3

The Imagemagick object's cropImage() method's 3rd and 4th argument are defining the upper-left corner of the crop. Either try passing those as null (and use the setGravity() method), or you may actually have to calculate where the crop is supposed to take place and pop those numbers into the cropImage() method (and don't bother with setGravity()).
For what it's worth, I have done a lot of coding around Imagemagick using PHP, and due to the horrible documentation of the Imagemagick extension, I resorted to making lots of nice'd command line calls.

Answer 4

I have created component to crop and resize images
here is the code (yii2)
Component uses imagine/imagine extension, install it before
<?php
namespace common\components;
use Imagine\Gd\Imagine;
use Imagine\Image\Box;
use Imagine\Image\ImageInterface;
use Imagine\Image\Point;
use Imagine\Imagick\Image;
class ResizeComponent
{
/**
* Resize image
* #param string $source source image path
* #param string $destination destination image path
* #param int $width
* #param int $height
* #param int $quality Jpeg sampling quality (0-100, 80 is best for seo)
* #return boolean is picture cropped
*/
public static function resizeImage($source, $destination, $width, $height, $quality = 80)
{
if (file_exists($source) && is_file($source)) {
$imagine = new Imagine();
$size = new Box($width, $height);
$mode = ImageInterface::THUMBNAIL_INSET;
$resizeimg = $imagine->open($source)->thumbnail($size, $mode);
$sizeR = $resizeimg->getSize();
$widthR = $sizeR->getWidth();
$heightR = $sizeR->getHeight();
$preserve = $imagine->create($size);
$startX = $startY = 0;
if ($widthR < $width) {
$startX = ($width - $widthR) / 2;
}
if ($heightR < $height) {
$startY = ($height - $heightR) / 2;
}
$preserve->paste($resizeimg, new Point($startX, $startY))
->save($destination, array('jpeg_quality' => $quality));
return true;
} else {
return false;
}
}
/**
* Crop image
* #param string $source source image path
* #param string $destination destination image path
* #param int $width
* #param int $height
* #param int $quality Jpeg sampling quality (0-100, 80 is best for seo)
* #return boolean is picture cropped
*/
public static function cropImage($source, $destination, $width, $height, $quality = 80)
{
if (file_exists($source) && is_file($source)) {
$imagine = new Imagine();
$size = new Box($width, $height);
$mode = ImageInterface::THUMBNAIL_OUTBOUND;
$image = $imagine->open($source)->thumbnail($size, $mode);
$image->thumbnail($size, $mode)->save($destination, array('jpeg_quality' => $quality));
return true;
} else {
return false;
}
}
}
The difference between crop and resize is :
crop cant display all image, so borders will be cropped (best for not informative thumbnails)
resize displays full image, but borders will be filled with static color (or transperency if needed) (best if all image needed to be shown, as in shop catalog)
Use this component statically, best practice as ServiceLocator