When cropping gif-images (I had no problems with jpg and png images), the canvas is not removed. Please run the following command on the cropped gif, to remove the blank space:
$im->setImagePage(0, 0, 0, 0);
(PECL imagick 2.0.0)
Imagick::cropImage — Extracts a region of the image
$width
, int $height
, int $x
, int $y
)Extracts a region of the image.
widthThe width of the crop
heightThe height of the crop
xThe X coordinate of the cropped region's top left corner
yThe Y coordinate of the cropped region's top left corner
Returns TRUE on success.
Throws ImagickException on error.
Example #1 Imagick::cropImage()
<?php
function cropImage($imagePath, $startX, $startY, $width, $height) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->cropImage($width, $height, $startX, $startY);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>
When cropping gif-images (I had no problems with jpg and png images), the canvas is not removed. Please run the following command on the cropped gif, to remove the blank space:
$im->setImagePage(0, 0, 0, 0);
Actually, the Imagick::setImagePage(0,0,0,0) is also handy with jpgs and pngs, if you plan to do any more changes on the cropped image that involves positioning and/or gravity (I created a script that does crop, face blur and watermarking in one go, and had a hell of a time determining why the blurs and the watermark text never showed up...).
Here is a simple function to create a thumbnail. It accepts an additional parameter to set the focus point of the generated thumbnail:
<?php
function thumbnail($image, $new_w, $new_h, $focus = 'center')
{
$w = $image->getImageWidth();
$h = $image->getImageHeight();
if ($w > $h) {
$resize_w = $w * $new_h / $h;
$resize_h = $new_h;
}
else {
$resize_w = $new_w;
$resize_h = $h * $new_w / $w;
}
$image->resizeImage($resize_w, $resize_h, Imagick::FILTER_LANCZOS, 0.9);
switch ($focus) {
case 'northwest':
$image->cropImage($new_w, $new_h, 0, 0);
break;
case 'center':
$image->cropImage($new_w, $new_h, ($resize_w - $new_w) / 2, ($resize_h - $new_h) / 2);
break;
case 'northeast':
$image->cropImage($new_w, $new_h, $resize_w - $new_w, 0);
break;
case 'southwest':
$image->cropImage($new_w, $new_h, 0, $resize_h - $new_h);
break;
case 'southeast':
$image->cropImage($new_w, $new_h, $resize_w - $new_w, $resize_h - $new_h);
break;
}
}
?>
I have a function that takes an image, resize and crop it, and save it as normal, then resize it again and crop it again to create the thumbnail. The numbers of the second crop were WAY off, and the calculations were perfect, the problem, was the second crop wasn't resetting the imagePage, so if you try to crop the same image twice, it will be a good idea to reset it first:
<?php
$thumb = new Imagick($file)
$thumb->resizeImage($r_w1,$r_h1,Imagick::FILTER_CATROM,0.9, false);
$thumb->cropImage($w1,$h1,$l1,$t1);
$thumb->writeImage($destinationPath.'/'.$fileName);
$thumb->resizeImage($r_w2,$r_h2,Imagick::FILTER_CATROM,0.9, false);
$thumb->setImagePage(0, 0, 0, 0);
$thumb->cropImage($w2,$h2,$l2,$t2);
$thumb->writeImage($destinationPath.'/'.$fileNameThumb);
?>
BTW, i needed perfect dimentions so i had to set the "bestfit" to false.
There is an easiest way to crop an image :
$picture = new Imagick('animated_gif.gif');
foreach($picture as $frame){
$frame->cropImage($width, $height, $x, $y);
}