diff --git a/lib/Dither.dart b/lib/Dither.dart
index 7cc3f6c..839fe79 100644
--- a/lib/Dither.dart
+++ b/lib/Dither.dart
@@ -49,6 +49,8 @@ class PixelArray {
     }
   }
 
+  PixelArray.fromImageData(ImageData imagedata, int imageWidth): this.fromByteArray(imagedata.data, imageWidth);
+
   Uint8ClampedList toByteArray() {
     //TODO: look for longest array, or each line separately. Only gets width from line 1 currently.
     Uint8ClampedList result = new Uint8ClampedList(getHeight()*getWidth()*4);