diff --git a/lib/src/test/java/de/edux/augmentation/effects/BrightnessAugmentationTest.java b/lib/src/test/java/de/edux/augmentation/effects/BrightnessAugmentationTest.java
index 9471a6b..6d28fe8 100644
--- a/lib/src/test/java/de/edux/augmentation/effects/BrightnessAugmentationTest.java
+++ b/lib/src/test/java/de/edux/augmentation/effects/BrightnessAugmentationTest.java
@@ -1,94 +1,100 @@
 package de.edux.augmentation.effects;
 
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.Test;
+import static de.edux.augmentation.AugmentationTestUtils.loadTestImage;
+import static de.edux.augmentation.AugmentationTestUtils.openImageInPreview;
+import static org.junit.jupiter.api.Assertions.*;
 
-import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
-import static org.junit.jupiter.api.Assertions.*;
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
-
-import static de.edux.augmentation.AugmentationTestUtils.loadTestImage;
-import static de.edux.augmentation.AugmentationTestUtils.openImageInPreview;
+import javax.imageio.ImageIO;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
 
 public class BrightnessAugmentationTest {
 
-    private BufferedImage originalImage;
-    private BufferedImage augmentedImage;
-
-
-    @AfterEach
-    public void checkConformity() throws IOException {
-        int[] originalPixels =
-                originalImage.getRGB(0, 0, originalImage.getWidth(), originalImage.getHeight(), null, 0, originalImage.getWidth());
-        int[] augmentedPixels =
-                augmentedImage.getRGB(
-                        0,
-                        0,
-                        augmentedImage.getWidth(),
-                        augmentedImage.getHeight(),
-                        null,
-                        0,
-                        augmentedImage.getWidth());
-
-        assertNotNull(augmentedImage, "Augmented image should not be null.");
-
-        assertEquals(
-                originalImage.getWidth(),
-                augmentedImage.getWidth(),
-                "Augmented image width should match the specified width.");
-        assertEquals(
-                originalImage.getHeight(),
-                augmentedImage.getHeight(),
-                "Augmented image height should match the specified height.");
-        assertFalse(
-                Arrays.equals(originalPixels, augmentedPixels),
-                "The augmented image should differ from the original.");
-
-        Path outputPath = Paths.get("augmented.png");
-        ImageIO.write(augmentedImage, "png", outputPath.toFile());
-
-        assertTrue(Files.exists(outputPath), "Output image file should exist.");
-        assertTrue(Files.size(outputPath) > 0, "Output image file should not be empty.");
-    }
-    @Test
-    public void shouldIncreaseBrightness() throws IOException, InterruptedException {
-        originalImage = loadTestImage("augmentation" + File.separator + "fireworks.png");
-
-        double testValue = 0.5;
-        BrightnessAugmentation augmentation = new BrightnessAugmentation(testValue);
-        augmentedImage = augmentation.apply(originalImage);
-
-        for (int y = 0; y < originalImage.getHeight(); y++){
-            for (int x = 0; x < originalImage.getWidth(); x++){
-                assertTrue(originalImage.getRGB(x,y) <= augmentedImage.getRGB(x,y));
-            }
-        }
-
-        openImageInPreview(originalImage);
-        openImageInPreview(augmentedImage);
+  private BufferedImage originalImage;
+  private BufferedImage augmentedImage;
+
+  @AfterEach
+  public void checkConformity() throws IOException {
+    int[] originalPixels =
+        originalImage.getRGB(
+            0,
+            0,
+            originalImage.getWidth(),
+            originalImage.getHeight(),
+            null,
+            0,
+            originalImage.getWidth());
+    int[] augmentedPixels =
+        augmentedImage.getRGB(
+            0,
+            0,
+            augmentedImage.getWidth(),
+            augmentedImage.getHeight(),
+            null,
+            0,
+            augmentedImage.getWidth());
+
+    assertNotNull(augmentedImage, "Augmented image should not be null.");
+
+    assertEquals(
+        originalImage.getWidth(),
+        augmentedImage.getWidth(),
+        "Augmented image width should match the specified width.");
+    assertEquals(
+        originalImage.getHeight(),
+        augmentedImage.getHeight(),
+        "Augmented image height should match the specified height.");
+    assertFalse(
+        Arrays.equals(originalPixels, augmentedPixels),
+        "The augmented image should differ from the original.");
+
+    Path outputPath = Paths.get("augmented.png");
+    ImageIO.write(augmentedImage, "png", outputPath.toFile());
+
+    assertTrue(Files.exists(outputPath), "Output image file should exist.");
+    assertTrue(Files.size(outputPath) > 0, "Output image file should not be empty.");
+  }
+
+  @Test
+  public void shouldIncreaseBrightness() throws IOException, InterruptedException {
+    originalImage = loadTestImage("augmentation" + File.separator + "shaman-shadows.png");
+
+    double testValue = 0.35;
+    BrightnessAugmentation augmentation = new BrightnessAugmentation(testValue);
+    augmentedImage = augmentation.apply(originalImage);
+
+    for (int y = 0; y < originalImage.getHeight(); y++) {
+      for (int x = 0; x < originalImage.getWidth(); x++) {
+        assertTrue(originalImage.getRGB(x, y) <= augmentedImage.getRGB(x, y));
+      }
     }
 
-    @Test
-    public void shouldDecreaseBrightness() throws IOException, InterruptedException {
-        originalImage = loadTestImage("augmentation" + File.separator + "national-park.png");
+    openImageInPreview(originalImage);
+    openImageInPreview(augmentedImage);
+  }
 
-        double testValue= -0.5;
-        BrightnessAugmentation augmentation = new BrightnessAugmentation(testValue);
-        augmentedImage = augmentation.apply(originalImage);
+  @Test
+  public void shouldDecreaseBrightness() throws IOException, InterruptedException {
+    originalImage = loadTestImage("augmentation" + File.separator + "shaman-shadows.png");
 
-        for (int y = 0; y < originalImage.getHeight(); y++){
-            for (int x = 0; x < originalImage.getWidth(); x++){
-                assertTrue(originalImage.getRGB(x,y) >= augmentedImage.getRGB(x,y));
-            }
-        }
+    double testValue = -0.5;
+    BrightnessAugmentation augmentation = new BrightnessAugmentation(testValue);
+    augmentedImage = augmentation.apply(originalImage);
 
-        openImageInPreview(originalImage);
-        openImageInPreview(augmentedImage);
+    for (int y = 0; y < originalImage.getHeight(); y++) {
+      for (int x = 0; x < originalImage.getWidth(); x++) {
+        assertTrue(originalImage.getRGB(x, y) >= augmentedImage.getRGB(x, y));
+      }
     }
+
+    openImageInPreview(originalImage);
+    openImageInPreview(augmentedImage);
+  }
 }
diff --git a/lib/src/test/resources/augmentation/shaman-shadows.png b/lib/src/test/resources/augmentation/shaman-shadows.png
new file mode 100644
index 0000000..87f6566
Binary files /dev/null and b/lib/src/test/resources/augmentation/shaman-shadows.png differ