diff --git a/src/routes/dither/+page.svelte b/src/routes/dither/+page.svelte
index 6d4542b..471ad8d 100644
--- a/src/routes/dither/+page.svelte
+++ b/src/routes/dither/+page.svelte
@@ -4,10 +4,10 @@
     import { onMount } from 'svelte';
   
   const DITHERING_ALGORITHMS = {
-    atkinson: (imageData) => Dither.atkinson(imageData),
-    bayer: (imageData) => Dither.bayer(imageData, 170),
-    floydSteinberg: (imageData) => Dither.floydsteinberg(imageData),
-    threshold: (imageData) => Dither.threshold(imageData, 2),
+    atkinson: (imageData: ImageData) => Dither.atkinson(imageData),
+    bayer: (imageData: ImageData) => Dither.bayer(imageData, 170),
+    floydSteinberg: (imageData: ImageData) => Dither.floydsteinberg(imageData),
+    threshold: (imageData: ImageData) => Dither.threshold(imageData, 2),
   }
 
   let canvas: HTMLCanvasElement;