Laravel Image Intervention 调整大小质量损失
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Laravel Image Intervention resize quality loss
提问by kipzes
In my Laravel web-application I make use of the Intervention Image library. I'm saving three versions of the uploaded image: 'original', '500_auto'and a custom size image.
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);
}
The driver of Intervention is set in the config as 'gd':
干预的驱动程序在配置中设置为'gd'：
'driver' => 'gd'
This is the image I'm uploading: original.jpg
这是我上传的图片：original.jpg
And this is the result from the custom thumb with the config settings set to exact the original sizes (1800 x 586): 1800_586.jpg
这是自定义缩略图的结果，配置设置设置为精确原始尺寸（1800 x 586）：1800_586.jpg
As you can see the second image there is a lot of quality loss in the resized image. How can I fix this?
正如您所看到的第二张图片，调整后的图片有很多质量损失。我怎样才能解决这个问题？
回答by Joel Hinz
You're first resizing the image to a small format, then you take the small image and resize that to the original size again. If you reverse the order, you'll go from original size -> original size -> small size instead.
您首先将图像大小调整为小格式，然后拍摄小图像并再次将其调整为原始大小。如果您颠倒顺序，您将从原始尺寸 -> 原始尺寸 -> 小尺寸改为。
Personally, I usually prefer to redo the Image::make()call for every new image, just to make sure I don't screw something like this up along the way.
就个人而言，我通常更喜欢Image::make()为每个新图像重新调用，以确保我不会在此过程中搞砸这样的事情。
回答by user2138568
You can use "backup()" method to save the object's status and "reset()" method to return back to backup state:
您可以使用“backup()”方法保存对象的状态和“reset()”方法返回备份状态：
// create an image
$img = Image::make('public/foo.jpg');
// backup status
$img->backup();
// perform some modifications
$img->resize(320, 240);
$img->invert();
$img->save('public/small.jpg');
// reset image (return to backup state)
$img->reset();
// perform other modifications
$img->resize(640, 480);
$img->invert();
$img->save('public/large.jpg');
more info on this page: http://image.intervention.io/api/reset
此页面上的更多信息：http: //image.intervention.io/api/reset
