Change method signature

src/Drivers/Gd/ImageFactory.php

@@ -60,7 +60,7 @@ public function add($source, float $delay = 1): self
         return new Image($frames);
     }
 
-    protected function newCore(int $width, int $height)
+    public function newCore(int $width, int $height)
     {
         $core = imagecreatetruecolor($width, $height);
         $color = imagecolorallocatealpha($core, 0, 0, 0, 127);

src/Drivers/Imagick/ImageFactory.php

@@ -61,7 +61,7 @@ public function add($source, float $delay = 1): self
         return new Image($animation->imagick);
     }
 
-    protected function newCore(int $width, int $height)
+    public function newCore(int $width, int $height)
     {
         $imagick = new Imagick();
         $imagick->newImage($width, $height, new ImagickPixel('rgba(0, 0, 0, 0)'), 'png');

src/Interfaces/FactoryInterface.php

@@ -20,4 +20,12 @@ public function newImage(int $width, int $height): ImageInterface;
      * @return ImageInterface
      */
     public function newAnimation(callable $callback): ImageInterface;
+
+    /**
+     * Create new driver specific core image object
+     *
+     * @param int $width
+     * @param int $height
+     */
+    public function newCore(int $width, int $height);
 }

tests/Drivers/Gd/ImageFactoryTest.php

@@ -2,6 +2,7 @@
 
 namespace Intervention\Image\Tests\Drivers\Gd;
 
+use GdImage;
 use Intervention\Image\Drivers\Gd\Image;
 use Intervention\Image\Drivers\Gd\ImageFactory;
 use Intervention\Image\Tests\TestCase;
@@ -29,4 +30,11 @@ public function testNewAnimation(): void
         $this->assertInstanceOf(Image::class, $image);
         $this->assertEquals(2, $image->count());
     }
+
+    public function testNewCore(): void
+    {
+        $factory = new ImageFactory();
+        $core = $factory->newCore(3, 2);
+        $this->assertInstanceOf(GdImage::class, $core);
+    }
 }