如何通过 imagine 扩展在 yii2 中调整图像大小

Question

上传后我使用波纹管功能调整图像大小以显示在我的 post 上。但它仅适用于大于 500px 300px 的图像。当我上传小于此尺寸的图片时，我的网站图片行会崩溃。

use yii\imagine\Image;    
public function upload() {
            $this->pictureFile->saveAs('../files/upload/' . $this->pictureFile->baseName . '.' . $this->pictureFile->extension);

            Image::thumbnail('../files/upload/' . $this->pictureFile, 500, 300)
                    ->save('../files/upload/thumbnail-500x300/' . $this->pictureFile->baseName . '.' . $this->pictureFile->extension, 
                            ['quality' => 70]);
            unlink('../files/upload/' . $this->pictureFile->baseName . '.'  . $this->pictureFile->extension);
        }

Answer 1

而不是Image::thumbnail，尝试以下

$imagine = Image::getImagine();
$image = $imagine->open('../files/upload/' . $this->pictureFile);
$image->resize(new Box(500, 300))->save('../files/upload/thumbnail-500x300/' . $this->pictureFile->baseName . '.' . $this->pictureFile->extension, ['quality' => 70]);

还没有测试过，但是因为 yii 的 Image 只是 Imagine 库的一个包装器，这应该可以进行微小的更改（如果需要的话）。

是的，在使用上面的代码之前，您需要在文件中 use Imagine\Image\Box;。

Answer 2

使用如下调整大小的方法

 use yii\imagine\Image;  
 use Imagine\Image\Box;  

 public function upload() {
        $this->pictureFile->saveAs('../files/upload/' . $this->pictureFile->baseName . '.' . $this->pictureFile->extension);

        Image::thumbnail('../files/upload/' . $this->pictureFile, 500, 300)
                ->resize(new Box(500,300))
                ->save('../files/upload/thumbnail-500x300/' . $this->pictureFile->baseName . '.' . $this->pictureFile->extension, 
                        ['quality' => 70]);
        unlink('../files/upload/' . $this->pictureFile->baseName . '.'  . $this->pictureFile->extension);
    }

Answer 3

    Yii::setAlias('newsfolder', dirname(dirname(__DIR__)) . '/frontend/web/extraimages/');

    $model->img = UploadedFile::getInstance($model,'img');
    if (!empty($model->img)){
        $model->img->saveAs( Yii::getAlias('@newsfolder/').$filename.'.'.$model->img->extension );
        $model->img =  $filename.'.'.$model->img->extension;
        $imagine = Image::getImagine();
        $image = $imagine->open(Yii::getAlias('@newsfolder/'.$model->img));
        $image->resize(new Box(500, 300))->save(Yii::getAlias('@newsfolder/'.$model->img, ['quality' => 70]));
    }

Answer 4

$imagine = Image::getImagine();
        $imagine = $imagine->open($openPath);
        $sizes = getimagesize ( $openPath ); 
        /*                   
           [0] => 604
           [1] => 244
           [2] => 3
           [3] => width="604" height="244"
           [bits] => 8
           [mime] => image/png
        ) */
        $width = 200;
        $height = round($sizes[1]*$width/$sizes[0]);        
        $imagine = $imagine->resize(new Box($width, $height))->save($savePath, ['quality' => 60]);

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