Defining conversions

When adding files to the medialibrary it can automatically create derived versions such as thumbnails and banners.

Media conversions will be executed whenever a jpg, png, svg, pdf, mp4 , mov or webm file is added to the medialibrary. By default, the conversions will be saved as a jpg files. This can be overwritten using the format() or keepOriginalImageFormat() methods.

Internally, spatie/image is used to manipulate the images. You can use any manipulation function from that package.

##A single conversion

You should add a method called registerMediaConversions to your model. In that model you can define the media conversion. Here's an example:

use Illuminate\Database\Eloquent\Model;
use Spatie\MediaLibrary\Models\Media;
use Spatie\MediaLibrary\HasMedia\HasMedia;
use Spatie\MediaLibrary\HasMedia\HasMediaTrait;

class NewsItem extends Model implements HasMedia
{
    use HasMediaTrait;

    public function registerMediaConversions(Media $media = null)
    {
        $this->addMediaConversion('thumb')
              ->width(368)
              ->height(232)
              ->sharpen(10);
    }
}

Let's add an image to the medialibrary.

$media = NewsItem::first()->addMedia($pathToImage)->toMediaCollection();

Besides storing the original item, the medialibrary also has created a derived image.

$media->getPath();  // the path to the where the original image is stored
$media->getPath('thumb') // the path to the converted image with dimensions 368x232

$media->getUrl();  // the url to the where the original image is stored
$media->getUrl('thumb') // the url to the converted image with dimensions 368x232

##Using multiple conversions

You can register as many media conversions as you want

// in your model
use Spatie\Image\Manipulations;

    public function registerMediaConversions(Media $media = null)
    {
        $this->addMediaConversion('thumb')
              ->width(368)
              ->height(232)
              ->sharpen(10);

        $this->addMediaConversion('old-picture')
              ->sepia()
              ->border(10, 'black', Manipulations::BORDER_OVERLAY);
    }

Use the conversions like this:

$media->getUrl('thumb') // the url to the thubmnail
$media->getUrl('old-picture') // the url to the sepia, bordered version

##Performing conversions on specific collections

By default a conversion will be performed on all files regardless of which collection is used. Conversions can also be performed on all specific collections by adding a call to performOnCollections.

This is how that looks like in the model:

// in your model
    public function registerMediaConversions(Media $media = null)
    {
        $this->addMediaConversion('thumb')
              ->width(368)
              ->height(232)
              ->performOnCollections('images', 'downloads');
    }

// a thumbnail will be generated for this media item
$media = $newsItem->addMedia($pathToImage)->toMediaCollection('images');
$media->getUrl('thumb') // the url to the thubmnail

//but not for this one
$media = $newsItem->addMedia($pathToImage)->toMediaCollection('other collection');
$media->getUrl('thumb') // returns ''

##Queuing conversions

By default, a conversion will be added to the queue that you've specified in the configuration. If you want your image to be created directly (and not on a queue) use nonQueued on a conversion.

// in your model
public function registerMediaConversions(Media $media = null)
{
    $this->addMediaConversion('thumb')
            ->width(368)
            ->height(232)
            ->nonQueued();
}

##Using model properties in a conversion

When registering conversions inside the registerMediaConversions function you won't have access to your model properties by default. If you want to use a property of your model as input for defining a conversion you must set registerMediaConversionsUsingModelInstance to true on your model.

// in your model
    public $registerMediaConversionsUsingModelInstance = true;

    public function registerMediaConversions(Media $media = null)
    {
        $this->addMediaConversion('thumb')
              ->width($this->width)
              ->height($this->height)
              ->performOnCollections('images', 'downloads');
    }

Be aware that this can lead to a hit in performance. When processing media the medialibrary has to perform queries to fetch each separate model.