在PHP Imagick中裁剪错误? [英] Crop bug in PHP Imagick?

问题描述

我试图裁剪动画gif，在输出中我得到了相同大小的图像，但是被裁剪了.

I was trying to crop the animated gif and in the output i'm getting the same sized image, but cropped.

画布上充满了很多空白.

A lot of empty space is filled with canvas.

例如，我将gif动画设置为600x100，但要求进行100x100的裁剪，在输出中我得到的是600x100的图像，其中包含裁剪的图像和空白区域.

For example i had animated gif 600x100, but have requested 100x100 crop, on the output i'm getting 600x100 image with cropped image and empty space.

有人知道该问题的解决方案吗?

Someone knows the solution for this issue?

$gif = new Imagick($s['src']);

foreach($gif as $frame){
  $frame->cropImage($s['params']['w'], $s['params']['h'], $s['params']['x'], $s['params']['y']);            
}   

$gif->writeImages($s['dest_path'] .'/'. $fullname,true);

推荐答案

我遇到了与您相同的问题，发现解决方案使用了coalesceimages函数.

I've been having the same problem as you, and I found the solution was using the coalesceimages function.

这是一个使用Imagick在php中裁剪和调整动画gif大小的工作示例:

Here's a working example for crop and resize an animated gif in php with Imagick:

<?php
// $width and $height are the "big image"'s proportions
if($width > $height) {
    $x     = ceil(($width - $height) / 2 );
    $width = $height;
} elseif($height > $width) {
    $y      = ceil(($height - $width) / 2);
    $height = $width;
}

$image = new Imagick(HERE_YOU_PUT_BIG_IMAGE_PATH);
$image = $image->coalesceImages(); // the trick!
foreach ($image as $frame) {
    $frame->cropImage($width, $height, $x, $y); // You crop the big image first
    $frame->setImagePage(0, 0, 0, 0); // Remove canvas
}
$image = $image->coalesceImages(); // We do coalesceimages again because now we need to resize
foreach ($image as $frame) {
    $frame->resizeImage($newWidth, $newHeight,Imagick::FILTER_LANCZOS,1); // $newWidth and $newHeight are the proportions for the new image
}
$image->writeImages(CROPPED_AND_RESIZED_IMAGE_PATH_HERE, true);
?>

上面的代码用于生成具有和高度相同的缩略图. 您可以按照自己的方式更改它.

Code above is being used for generating thumbnails with same with and height. You might change it the way you want.

注意，当使用$ frame-> cropImage($ width，$ height，$ x，$ y);您应该将可能需要的值放在此处.

Notice that when using $frame->cropImage($width, $height, $x, $y); you should put there the values you might need.

IE $ frame-> cropImage($ s ['params'] ['w']，$ s ['params'] ['h']，$ s ['params'] ['x']，$ s ['params'] ['y']);

IE $frame->cropImage($s['params']['w'], $s['params']['h'], $s['params']['x'], $s['params']['y']);

当然，如果您只是想裁剪而不是裁剪和调整大小，可以这样做:

Of course that if you just want to crop instead of croping and resizing, just can do this:

$image = new Imagick(HERE_YOU_PUT_BIG_IMAGE_PATH);
$image = $image->coalesceImages(); // the trick!
foreach ($image as $frame) {
    $frame->cropImage($s['params']['w'], $s['params']['h'], $s['params']['x'], $s['params']['y']);
    $frame->setImagePage(0, 0, 0, 0); // Remove canvas
}

希望有帮助！

Ps:对不起，我的英语:)

Ps: sorry for my english :)

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