Add remove animation modifiers

src/Drivers/Abstract/AbstractImage.php

@@ -334,6 +334,13 @@ public function padDown(
         );
     }
 
+    public function removeAnimation(int $position = 0): ImageInterface
+    {
+        return $this->modify(
+            $this->resolveDriverClass('Modifiers\RemoveAnimationModifier', $position)
+        );
+    }
+
     public function destroy(): void
     {
         $this->modify(

src/Drivers/Gd/Modifiers/RemoveAnimationModifier.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Intervention\Image\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Collection;
+use Intervention\Image\Drivers\Gd\Image;
+use Intervention\Image\Exceptions\RuntimeException;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class RemoveAnimationModifier implements ModifierInterface
+{
+    public function __construct(protected int $position = 0)
+    {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        if (!$image->isAnimated()) {
+            throw new RuntimeException('Image is not animated.');
+        }
+
+        $frames = new Collection();
+        foreach ($image as $key => $frame) {
+            if ($this->position == $key) {
+                $frames->push($frame);
+            } else {
+                imagedestroy($frame->getCore());
+            }
+        }
+
+        return new Image($frames);
+    }
+}

src/Drivers/Imagick/Image.php

@@ -26,13 +26,13 @@ public function getImagick(): Imagick
 
     public function getFrame(int $position = 0): ?FrameInterface
     {
-        try {
-            $this->imagick->setIteratorIndex($position);
-        } catch (ImagickException $e) {
-            return null;
+        foreach ($this->imagick as $core) {
+            if ($core->getIteratorIndex() == $position) {
+                return new Frame($core);
+            }
         }
 
-        return new Frame($this->imagick->current());
+        return null;
     }
 
     public function addFrame(FrameInterface $frame): ImageInterface

src/Drivers/Imagick/Modifiers/RemoveAnimationModifier.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Intervention\Image\Drivers\Imagick\Modifiers;
+
+use Imagick;
+use Intervention\Image\Drivers\Imagick\Image;
+use Intervention\Image\Exceptions\RuntimeException;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class RemoveAnimationModifier implements ModifierInterface
+{
+    public function __construct(protected int $position = 0)
+    {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        if (!$image->isAnimated()) {
+            throw new RuntimeException('Image is not animated.');
+        }
+
+        $imagick = new Imagick();
+        foreach ($image as $frame) {
+            if ($frame->getCore()->getIteratorIndex() == $this->position) {
+                $imagick->addImage($frame->getCore()->getImage());
+            }
+        }
+
+        $image->destroy();
+
+        return new Image($imagick);
+    }
+}

src/Interfaces/ImageInterface.php

@@ -62,6 +62,13 @@ public function getSize(): SizeInterface;
      */
     public function isAnimated(): bool;
 
+    /**
+     * Remove all frames but keep the one at the specified position
+     *
+     * @param  int $position
+     * @return ImageInterface
+     */
+    public function removeAnimation(int $position = 0): ImageInterface;
 
     /**
      * Apply given modifier to current image

tests/Drivers/Gd/Modifiers/RemoveAnimationModifierTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Drivers\Gd\Modifiers\RemoveAnimationModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateGdTestImage;
+
+/**
+ * @requires extension gd
+ * @covers \Intervention\Image\Drivers\Gd\Modifiers\RemoveAnimationModifier
+ */
+class RemoveAnimationModifierTest extends TestCase
+{
+    use CanCreateGdTestImage;
+
+    public function testApply(): void
+    {
+        $image = $this->createTestImage('animation.gif');
+        $this->assertEquals(8, count($image));
+        $image = $image->modify(new RemoveAnimationModifier(2));
+        $this->assertEquals(1, count($image));
+    }
+}

tests/Drivers/Imagick/Modifiers/RemoveAnimationModifierTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Imagick\Modifiers;
+
+use Intervention\Image\Drivers\Imagick\Modifiers\RemoveAnimationModifier;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateImagickTestImage;
+
+/**
+ * @requires extension imagick
+ * @covers \Intervention\Image\Drivers\Imagick\Modifiers\RemoveAnimationModifier
+ */
+class RemoveAnimationModifierTest extends TestCase
+{
+    use CanCreateImagickTestImage;
+
+    public function testApply(): void
+    {
+        $image = $this->createTestImage('animation.gif');
+        $this->assertEquals(8, count($image));
+        $image = $image->modify(new RemoveAnimationModifier(2));
+        $this->assertEquals(1, count($image));
+    }
+}