如何通过yii2中的想象扩展来调整图像大小

我使用波纹管功能在上传后调整图像大小以显示在我的帖子上.
但它适用于大于500px 300px的图像.当我上传小于这个尺寸的图片时,我的网站图片行会中断.

use yiiimagineImage;    
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);
        }

use yiiimagineImage;  
 use ImagineImageBox;  

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

        Image::thumbnail('../files/upload/' . $this->pictureFile,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);
    }

（编辑：安卓应用网）

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