Laravel图像干预压缩

我有一个脚本，通过干预保存和缓存图像，它的工作100％

但是我想弄清楚如何为jpg和png文件添加75％压缩，但我不知道我会在这种情况下应用它 .

我不认为PNG文件可以被压缩而不是软件，所以我不确定它是否相同？

这里有一个压缩的例子：http://image.intervention.io/api/save

/* ////////////////////// IMAGES //////////////////////// */
Route::get( '/media/{size}/{crop}/{name}', function ( $size = null, $crop = null, $name = null ) {
    if ( ! is_null( $size ) and ! is_null( $name ) and ! is_null( $crop ) ) {
        $size = explode( 'x', $size );

        $hours = 48;
        $cache_length = $hours * 60;

        switch ( $crop ) {

            /*///////////////////////// no crop and change ratio */
            case "0":
                $cache_image = Image::cache( function ( $image ) use ( $size, $name ) {
                    return $image->make( url( '/uploads/' . $name ) )->resize( $size[0], $size[1] )->sharpen(5);
                }, $cache_length);
                break;

            /*///////////////////////// crop - NO upsize */
            default:
            case "1":
                $cache_image = Image::cache( function ( $image ) use ( $size, $name ) {
                    return $image->make( url( '/uploads/' . $name ) )->fit( $size[0], $size[1], function ( $constraint ) {
                        $constraint->upsize();
                    } )->sharpen(5);
                }, $cache_length );
                break;

            /*///////////////////////// crop - WITH upsize */
            case "2":
                $cache_image = Image::cache( function ( $image ) use ( $size, $name ) {
                    return $image->make( url( '/uploads/' . $name ) )->fit( $size[0], $size[1], function ( $constraint ) {
                        //$constraint->upsize();
                    } )->sharpen(5);
                }, $cache_length );
                break;

            /*///////////////////////// No crop & add borders */
            case "3":

                $cache_image = Image::cache( function ( $image ) use ( $size, $name ) {

                    $image->make( url( '/uploads/' . $name ) )->resize( $size[0], $size[1], function ( $constraint ) {
                        $constraint->aspectRatio();
                        $constraint->upsize();
                    } )->sharpen(5);

                    $image->resizeCanvas($size[0], $size[1], 'center', false, array(255, 255, 255, 0.0));

                    return $image;

                }, $cache_length );
                break;

            /*///////////////////////// No crop */
            case "4":
                $cache_image = Image::cache( function ( $image ) use ( $size, $name ) {

                    $image->make( url( '/uploads/' . $name ) )->resize( $size[0], $size[1], function ( $constraint ) {
                        $constraint->aspectRatio();
                        $constraint->upsize();
                    } )->sharpen(5);

                    //$image->resizeCanvas($size[0], $size[1], 'center', false, array(255, 255, 255, 0.0));

                    return $image;

                }, $cache_length );
                break;

        }

        return Response::make( $cache_image, 200, [ 'Content-Type' => 'image' ] )->setMaxAge(604800)->setPublic();

    } else {
        abort( 404 );
    }
} );