Laravel图像干预调整了质量损失

在我的Laravel网络应用程序中,我使用了干预图像库.我保存上传图像的三个版本:'original','500_auto'和自定义尺寸的图像.

$image = Image::make(Input::file('file');

// Save the orignal image
$image->save($folder . 'original.' . $extension);

// Save 500_auto image
$image->resize(500, null, function($constraint) {
    $constraint->aspectRatio();
});
$image->save($folder . '500_auto.' . $extension, 100);

// Check if size is set
if (isset($config->images->width) && isset($config->images->height)) {
    // Assign values
    $width  = $config->images->width;
    $height = $config->images->height;
    // Create the custom thumb
    $image->resize($width, $height, function($constraint) {
        $constraint->aspectRatio();
    });
    $image->save($folder . $width . '_' . $height . '.' . $extension, 100);
}

'driver' => 'gd'