php_imagick是怎么实现复古效果的呢？

Posted 2020-08-23 咸蛋超哥

php_imagick程序示例

1.创建一个缩略图并显示出来

<?php
header(‘Content-type: image/jpeg‘);
$image = new Imagick(‘image.jpg‘);
// If 0 is provided as a width or height parameter,// aspect ratio is maintained
$image->thumbnailImage(100, 0);
echo $image;
?>

2.创建一个目录下的缩略图，并保存

<?php
$images = new Imagick(glob(‘images/*.JPG‘));
foreach($images as $image) {
// Providing 0 forces thumbnailImage to maintain aspect ratio
$image->thumbnailImage(1024,0);
}
$images->writeImages();
?>

3.缩略GIF动画图片

<?php
/* Create a new imagick object and read in GIF */
$im = new Imagick("example.gif");
/* Resize all frames */
foreach ($im as $frame) {
/* 50x50 frames */
$frame->thumbnailImage(50, 50);
/* Set the virtual canvas to correct size */
$frame->setImagePage(50, 50, 0, 0);
}/* Notice writeImages instead of writeImage */
$im->writeImages("example_small.gif", true);
?>

利用php_imagick实现复古效果的方法

先来看下效果图

复古效果展示

要实现以上效果，我们先用Photoshop用以下步骤实现。

打开原图
新建图层，使用颜色#C0FFFF填充后，不透明度设为44%，图层混合模式为柔光
新建图层，使用颜色#000699填充后，不透明设置为48%，图层混合模式为排除
合并图层

用PHP代码，也就只需要按照以上步骤实现即可，代码如下：

//打开图片
$im = new Imagick(‘./hebe.jpg‘);
//新建图层，使用颜色`#C0FFFF`填充后，不透明度设为`44%`
$layer = new Imagick();
$layer->newImage($im->getImageWidth(), $im->getImageHeight(), ‘#C0FFFF‘);
$layer->setImageOpacity (0.44);
//叠加到原图上，图层混合模式为`柔光`
$im->compositeImage($layer, Imagick::COMPOSITE_SOFTLIGHT, 0, 0);
//新建图层，使用颜色`#000699`填充后，不透明设置为`48%`
$layer = new Imagick();
$layer->newImage($im->getImageWidth(), $im->getImageHeight(), ‘#000699‘);
$layer->setImageOpacity (0.48);
//叠加到原图上，图层混合模式为`排除` 
$im->compositeImage($layer, Imagick::COMPOSITE_EXCLUSION, 0, 0);
//完成！
$im->writeImage(‘./vintage.jpg‘);

A new addition to Laravel is the ability to specify the creation of a resourceful controller when you are creating a new Model through Artisan. This means you can pass a -c or --controller flag to make:model:

php artisan make:model Post --controller Laravel Image Dimensions Validation

New in Laravel v5.3 is the ability to validate image files to ensure they meet certain dimensions and through the validator this can be setup with a string format:

‘avatar‘ => ‘dimensions:min_width=100,min_height=200,ratio=3/2‘

Now in v5.3.19 this can be specified through a fluent syntax similar to unique and exists validation rules :

Rule::dimensions()->minWidth(100)->minHeight(100)->ratio(3/2) Laravel Validation in and not_in

The in and not_in validation received the ability to pass an array.

// Previous in:php,laravel,... // New Rule::in([‘php‘,‘laravel‘])

Then the same for not_in

// Previous not_in:php,laravel,... // New Rule::notIn([‘php‘, ‘laravel‘])

Either style is valid and the new object-based style parses down into the old way. So you are free to use whichever suits your app.

After Validation Hook

Now your controllers can have a new withValidator method so you can easily call any hooks after validation:

protected function withValidator($validator) { $validator->after(function($validator) { if ($this->somethingElseIsInvalid()) { $validator->errors()->add(‘field‘, ‘Something is wrong with this field!‘); } }); }

Previously you had to manually setup the $validator = Validator::make() before you could use an after hook which meant you lost the ability to utilize the ValidatesRequests trait.

Upgrading Laravel

To get this latest version all you need to do is run composer update and you can find a complete list of changes in the changelog