how do i use imagick in php? (resize & crop)

Question

I use imagick for thumbnail crop, but sometimes cropped thumbnails are missing top part of the images (hair, eyes).

I was thinking to resize the image then crop it. Also, I need to keep the image size ratio.

Below is the php script I use for crop:

$im = new imagick( "img/20130815233205-8.jpg" );
$im->cropThumbnailImage( 80, 80 );
$im->writeImage( "thumb/th_80x80_test.jpg" );
echo '<img src="thumb/th_80x80_test.jpg">';

Thanks..

What errors are you getting? what is the expected output? What version of PHP? is imagick installed? More details please... — Elias Van Ootegem, Aug 19 '13 at 11:10
No, this is not about an error. imagick works fine. Above script does crop only. I want to RESIZE first, then I want to crop it, so I'm missing first step.. — newworroo, Aug 19 '13 at 11:55

score 36 · Accepted Answer · answered Aug 19 '13 at 13:38

This task is not easy as the "important" part may not always be at the same place. Still, using something like this

$im = new imagick("c:\\temp\\523764_169105429888246_1540489537_n.jpg");
$imageprops = $im->getImageGeometry();
$width = $imageprops['width'];
$height = $imageprops['height'];
if($width > $height){
    $newHeight = 80;
    $newWidth = (80 / $height) * $width;
}else{
    $newWidth = 80;
    $newHeight = (80 / $width) * $height;
}
$im->resizeImage($newWidth,$newHeight, imagick::FILTER_LANCZOS, 0.9, true);
$im->cropImage (80,80,0,0);
$im->writeImage( "D:\\xampp\\htdocs\\th_80x80_test.jpg" );
echo '<img src="th_80x80_test.jpg">';

(tested)

should work. The cropImage parameters (0 and 0) determine the upper left corner of the cropping area. So playing with these gives you differnt results of what stays in the image.

score 7 · Answer 2 · answered Sep 21 '17 at 04:50

Based on Martin's answer I made a more general function that resizes and crops Imagick image to fit given width and height (i.e. behaves exactly as CSS background-size: cover declaration):

/**
 * Resizes and crops $image to fit provided $width and $height.
 *
 * @param \Imagick $image
 *   Image to change.
 * @param int $width
 *   New desired width.
 * @param int $height
 *   New desired height.
 */
function image_cover(Imagick $image, $width, $height) {
  $ratio = $width / $height;

  // Original image dimensions.
  $old_width = $image->getImageWidth();
  $old_height = $image->getImageHeight();
  $old_ratio = $old_width / $old_height;

  // Determine new image dimensions to scale to.
  // Also determine cropping coordinates.
  if ($ratio > $old_ratio) {
    $new_width = $width;
    $new_height = $width / $old_width * $old_height;
    $crop_x = 0;
    $crop_y = intval(($new_height - $height) / 2);
  }
  else {
    $new_width = $height / $old_height * $old_width;
    $new_height = $height;
    $crop_x = intval(($new_width - $width) / 2);
    $crop_y = 0;
  }

  // Scale image to fit minimal of provided dimensions.
  $image->resizeImage($new_width, $new_height, imagick::FILTER_LANCZOS, 0.9, true);

  // Now crop image to exactly fit provided dimensions.
  $image->cropImage($new_width, $new_height, $crop_x, $crop_y);
}

Hope this may help somebody.

``imagick::FILTER_LANCZOS`` should be ``\Imagick::FILTER_LANCZOS`` — Mehmet S., Sep 26 '17 at 23:00
Last line `$image->cropImage($new_width, $new_height, ...` should be `$image->cropImage($width, $height, ...` — dersimn, Dec 14 '18 at 15:20
For me it works with `$image->cropImage($new_width, $new_height, 0,0);` — German Khokhlov, May 29 '19 at 15:21

Victor Steshyn · Answer 3 · 2023-02-24T22:21:20.953

My code. Please vote

// Imagick
$image = new Imagick($img);

// method 1 - resize to max width
if($type==1){
    $image->resizeImage($newWidth,0,Imagick::FILTER_LANCZOS,1);
// method 2 - resize to max height
}else if($type==2){
    $image->resizeImage(0,$newHeight,Imagick::FILTER_LANCZOS,1);
// method 1 - resize to max width or height
}else if($type==3){
    if($image->getImageHeight() <= $image->getImageWidth()){
        $image->resizeImage($newWidth,0,Imagick::FILTER_LANCZOS,1);
    }else{
        $image->resizeImage(0,$newHeight,Imagick::FILTER_LANCZOS,1);
    }
// method 4 - resize and crop to center
}else if($type==4){
    if($image->getImageHeight() <= $image->getImageWidth()){
        $image->resizeImage(0,$newheight,Imagick::FILTER_LANCZOS,1);
    }else{
        $image->resizeImage($newwidth,0,Imagick::FILTER_LANCZOS,1);
    }
    $cropWidth = $image->getImageWidth();
    $cropHeight = $image->getImageHeight();
    
    $image->cropimage(
        $newwidth,
        $newheight,
        ($cropWidth - $newwidth) / 2,
        ($cropHeight - $newheight) / 2
    );
}

$image->setImageFormat("jpeg");
$image->setImageCompression(Imagick::COMPRESSION_JPEG);
$image->writeImages($newImg, true);
$image->clear();
$image->destroy();

how do i use imagick in php? (resize & crop)

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