Imagick 照片多图像调整大小裁剪而不扭曲/拉伸 php

Question

我希望在调整图像大小时保持图像的纵横比。我有 94 000 张图像需要在社交网站上显示为预览图像。我遇到的挑战是一些用户上传了全长照片，结果它们在重新调整大小后显得拉长了。我正在使用 codeigniter 来实现这个。文件名在数据库 table 中。这是我使用的代码

if (file_exists($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles    /purchased_profiles/".$images_->_file_name)) {
    //echo "The file $filename exists";

    $thumb = new Imagick();

    $thumb->readImage($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles/purchased_profiles/".$images_->_file_name); 
    $orientation = $thumb->getImageOrientation(); 

    switch($orientation) { 
        case imagick::ORIENTATION_BOTTOMRIGHT: 
            $thumb->rotateimage("#000", 180); // rotate 180 degrees 
        break; 

        case imagick::ORIENTATION_RIGHTTOP: 
            $thumb->rotateimage("#000", 90); // rotate 90 degrees CW 
        break; 

        case imagick::ORIENTATION_LEFTBOTTOM: 
            $thumb->rotateimage("#000", -90); // rotate 90 degrees CCW 
        break; 
    }
    $thumb->resizeImage(160,160,Imagick::FILTER_LANCZOS,1);

    $thumb->writeImage($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles/purchased_profiles/160x160/".$images_->_file_name);
    $thumb->clear();
    $thumb->destroy(); 
}

Answer 1

如果上传的图像大小不同，这将是一个真正的挑战如果我要结合此处找到的解决方案 how do i use imagick in php? (resize & crop) 和您的代码，我可能会想出以下内容

      if (file_exists($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles/purchased_profiles/".$images_->_file_name)) {



        $thumb = new Imagick();

       $thumb->readImage($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles/purchased_profiles/".$images_->_file_name); 

$orientation = $thumb->getImageOrientation(); 

switch($orientation) { 
    case imagick::ORIENTATION_BOTTOMRIGHT: 
        $thumb->rotateimage("#000", 180); // rotate 180 degrees 
    break; 

    case imagick::ORIENTATION_RIGHTTOP: 
        $thumb->rotateimage("#000", 90); // rotate 90 degrees CW 
    break; 

    case imagick::ORIENTATION_LEFTBOTTOM: 
        $thumb->rotateimage("#000", -90); // rotate 90 degrees CCW 
    break; 
}

          //now check the width
        $width=$thumb->getImageWidth();

        //now check height
        $height=$thumb->getImageHeight();

       if ($height>$width) {

         $new_height=160;
         $new_width=(int)($width/$height*160);

         $thumb->resizeImage($new_width,$new_height,Imagick::FILTER_LANCZOS,1);

         $cropWidth = $thumb->getImageWidth();
         $cropHeight = $thumb->getImageHeight();
      $cropZoom=1;

     if ($cropZoom) {
       $newWidth = $cropWidth / 2;
       $newHeight = $cropHeight / 2;

    $thumb->cropimage(
        $new_width,
        $new_width,
        0,
        0
    );


      }
   } 
     elseif ($width>$height) {
     # code...

        $new_width=160;

        $new_height=(int)($height/$width*160);

       $thumb->resizeImage($new_width,$new_height,Imagick::FILTER_LANCZOS,1);
         }
       else{

        $thumb->resizeImage(160,160,Imagick::FILTER_LANCZOS,1);
        }   



           $thumb->writeImage($_SERVER["DOCUMENT_ROOT"]."/uploads/profiles/purchased_profiles/160x160/".$images_->_file_name);
        $thumb->clear();
       $thumb->destroy(); }

如果图像高度大于宽度，您可能需要裁剪，所以我决定裁剪尺寸等于从左下角到左角的宽度，这样您很可能不会错过人脸。祝你好运

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