Fix buffer size in QImageBuffer.cs

Dashboard/Media/Color/ImageBuffer.cs

@@ -22,7 +22,7 @@ namespace Dashboard.Media.Color
             Height = height;
             Depth = depth;
 
-            buffer = new byte[width * height * depth];
+            buffer = new byte[(long)width * height * depth * format.BytesPerPixel()];
         }
         ~QImageBuffer()
         {