diff --git a/src/Drivers/Gd/Encoders/PngEncoder.php b/src/Drivers/Gd/Encoders/PngEncoder.php
index bd6a90c0..8368b7a6 100644
--- a/src/Drivers/Gd/Encoders/PngEncoder.php
+++ b/src/Drivers/Gd/Encoders/PngEncoder.php
@@ -38,7 +38,6 @@ class PngEncoder extends GenericPngEncoder implements SpecializedInterface
      * Prepare given image instance for PNG format output according to encoder settings
      *
      * @param ImageInterface $image
-     * @param bool $indexed
      * @throws RuntimeException
      * @throws ColorException
      * @throws AnimationException
@@ -51,7 +50,7 @@ class PngEncoder extends GenericPngEncoder implements SpecializedInterface
         }
 
         // get blending color
-        $blendingColor =  $this->driver()->colorProcessor($image->colorspace())->colorToNative(
+        $blendingColor = $this->driver()->colorProcessor($image->colorspace())->colorToNative(
             $this->driver()->handleInput($this->driver()->config()->blendingColor)
         );
 
diff --git a/src/Drivers/Imagick/Encoders/PngEncoder.php b/src/Drivers/Imagick/Encoders/PngEncoder.php
index 06a7a03d..c3889b18 100644
--- a/src/Drivers/Imagick/Encoders/PngEncoder.php
+++ b/src/Drivers/Imagick/Encoders/PngEncoder.php
@@ -58,7 +58,7 @@ class PngEncoder extends GenericPngEncoder implements SpecializedInterface
         }
 
         // get blending color
-        $blendingColor =  $this->driver()->colorProcessor($image->colorspace())->colorToNative(
+        $blendingColor = $this->driver()->colorProcessor($image->colorspace())->colorToNative(
             $this->driver()->handleInput($this->driver()->config()->blendingColor)
         );
 
diff --git a/tests/BaseTestCase.php b/tests/BaseTestCase.php
index 41caa2aa..9aa89c0c 100644
--- a/tests/BaseTestCase.php
+++ b/tests/BaseTestCase.php
@@ -25,7 +25,7 @@ abstract class BaseTestCase extends MockeryTestCase
         return file_get_contents(self::getTestResourcePath($filename));
     }
 
-    public function getTestResourcePointer($filename = 'test.jpg')
+    public static function getTestResourcePointer($filename = 'test.jpg')
     {
         $pointer = fopen('php://temp', 'rw');
         fputs($pointer, self::getTestResourceData($filename));
diff --git a/tests/GdTestCase.php b/tests/GdTestCase.php
index 2cfa9527..ebe98a01 100644
--- a/tests/GdTestCase.php
+++ b/tests/GdTestCase.php
@@ -12,14 +12,14 @@ use Intervention\Image\Image;
 
 abstract class GdTestCase extends BaseTestCase
 {
-    public function readTestImage($filename = 'test.jpg'): Image
+    public static function readTestImage($filename = 'test.jpg'): Image
     {
         return (new Driver())->specialize(new FilePathImageDecoder())->decode(
-            $this->getTestResourcePath($filename)
+            static::getTestResourcePath($filename)
         );
     }
 
-    public function createTestImage(int $width, int $height): Image
+    public static function createTestImage(int $width, int $height): Image
     {
         $gd = imagecreatetruecolor($width, $height);
         imagefill($gd, 0, 0, imagecolorallocate($gd, 255, 0, 0));
@@ -32,7 +32,7 @@ abstract class GdTestCase extends BaseTestCase
         );
     }
 
-    public function createTestAnimation(): Image
+    public static function createTestAnimation(): Image
     {
         $gd1 = imagecreatetruecolor(3, 2);
         imagefill($gd1, 0, 0, imagecolorallocate($gd1, 255, 0, 0));
diff --git a/tests/ImagickTestCase.php b/tests/ImagickTestCase.php
index cbd24dcc..bef7b674 100644
--- a/tests/ImagickTestCase.php
+++ b/tests/ImagickTestCase.php
@@ -13,14 +13,14 @@ use Intervention\Image\Image;
 
 abstract class ImagickTestCase extends BaseTestCase
 {
-    public function readTestImage($filename = 'test.jpg'): Image
+    public static function readTestImage($filename = 'test.jpg'): Image
     {
         return (new Driver())->specialize(new FilePathImageDecoder())->decode(
-            $this->getTestResourcePath($filename)
+            static::getTestResourcePath($filename)
         );
     }
 
-    public function createTestImage(int $width, int $height): Image
+    public static function createTestImage(int $width, int $height): Image
     {
         $background = new ImagickPixel('rgb(255, 0, 0)');
         $imagick = new Imagick();
@@ -36,7 +36,7 @@ abstract class ImagickTestCase extends BaseTestCase
         );
     }
 
-    public function createTestAnimation(): Image
+    public static function createTestAnimation(): Image
     {
         $imagick = new Imagick();
         $imagick->setFormat('gif');
diff --git a/tests/Unit/Drivers/Gd/Encoders/PngEncoderTest.php b/tests/Unit/Drivers/Gd/Encoders/PngEncoderTest.php
index 69cc7d12..d9bf1da4 100644
--- a/tests/Unit/Drivers/Gd/Encoders/PngEncoderTest.php
+++ b/tests/Unit/Drivers/Gd/Encoders/PngEncoderTest.php
@@ -7,8 +7,10 @@ namespace Intervention\Image\Tests\Unit\Drivers\Gd\Encoders;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\RequiresPhpExtension;
 use Intervention\Image\Encoders\PngEncoder;
+use Intervention\Image\Interfaces\ImageInterface;
 use Intervention\Image\Tests\GdTestCase;
 use Intervention\Image\Tests\Traits\CanInspectPngFormat;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 #[RequiresPhpExtension('gd')]
 #[CoversClass(\Intervention\Image\Encoders\PngEncoder::class)]
@@ -34,4 +36,59 @@ final class PngEncoderTest extends GdTestCase
         $this->assertMediaType('image/png', (string) $result);
         $this->assertTrue($this->isInterlacedPng((string) $result));
     }
+
+    #[DataProvider('indexedDataProvider')]
+    public function testEncoderIndexed(ImageInterface $image, PngEncoder $encoder, string $result): void
+    {
+        $this->assertEquals(
+            $result,
+            $this->pngColorType((string) $encoder->encode($image)),
+        );
+    }
+
+    public static function indexedDataProvider(): array
+    {
+        return [
+            [
+                static::createTestImage(3, 2), // new
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::createTestImage(3, 2), // new
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('circle.png'), // truecolor-alpha
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('circle.png'), // indexedcolor-alpha
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('tile.png'), // indexed
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('tile.png'), // indexed
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('test.jpg'), // jpeg
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('test.jpg'), // jpeg
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+        ];
+    }
 }
diff --git a/tests/Unit/Drivers/Imagick/Encoders/PngEncoderTest.php b/tests/Unit/Drivers/Imagick/Encoders/PngEncoderTest.php
index 268ac830..b905bd28 100644
--- a/tests/Unit/Drivers/Imagick/Encoders/PngEncoderTest.php
+++ b/tests/Unit/Drivers/Imagick/Encoders/PngEncoderTest.php
@@ -7,8 +7,10 @@ namespace Intervention\Image\Tests\Unit\Drivers\Imagick\Encoders;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\RequiresPhpExtension;
 use Intervention\Image\Encoders\PngEncoder;
+use Intervention\Image\Interfaces\ImageInterface;
 use Intervention\Image\Tests\ImagickTestCase;
 use Intervention\Image\Tests\Traits\CanInspectPngFormat;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 #[RequiresPhpExtension('imagick')]
 #[CoversClass(\Intervention\Image\Encoders\PngEncoder::class)]
@@ -34,4 +36,59 @@ final class PngEncoderTest extends ImagickTestCase
         $this->assertMediaType('image/png', (string) $result);
         $this->assertTrue($this->isInterlacedPng((string) $result));
     }
+
+    #[DataProvider('indexedDataProvider')]
+    public function testEncoderIndexed(ImageInterface $image, PngEncoder $encoder, string $result): void
+    {
+        $this->assertEquals(
+            $result,
+            $this->pngColorType((string) $encoder->encode($image)),
+        );
+    }
+
+    public static function indexedDataProvider(): array
+    {
+        return [
+            [
+                static::createTestImage(3, 2), // new
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::createTestImage(3, 2), // new
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('circle.png'), // truecolor-alpha
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('circle.png'), // indexedcolor-alpha
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('tile.png'), // indexed
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('tile.png'), // indexed
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+            [
+                static::readTestImage('test.jpg'), // jpeg
+                new PngEncoder(indexed: false),
+                'truecolor-alpha',
+            ],
+            [
+                static::readTestImage('test.jpg'), // jpeg
+                new PngEncoder(indexed: true),
+                'indexed',
+            ],
+        ];
+    }
 }