diff --git a/upptst/Dither/Dither.upp b/upptst/Dither/Dither.upp
new file mode 100644
index 000000000..46b07a61f
--- /dev/null
+++ b/upptst/Dither/Dither.upp
@@ -0,0 +1,10 @@
+uses
+	CtrlLib,
+	plugin/jpg;
+
+file
+	main.cpp;
+
+mainconfig
+	"" = "GUI SSE2";
+
diff --git a/upptst/Dither/init b/upptst/Dither/init
new file mode 100644
index 000000000..a7648e050
--- /dev/null
+++ b/upptst/Dither/init
@@ -0,0 +1,5 @@
+#ifndef _Dither_icpp_init_stub
+#define _Dither_icpp_init_stub
+#include "CtrlLib/init"
+#include "plugin/jpg/init"
+#endif
diff --git a/upptst/Dither/main.cpp b/upptst/Dither/main.cpp
new file mode 100644
index 000000000..33bb12d9a
--- /dev/null
+++ b/upptst/Dither/main.cpp
@@ -0,0 +1,33 @@
+#include <CtrlLib/CtrlLib.h>
+
+using namespace Upp;
+
+struct MyApp : TopWindow {
+	Image image;
+	Image image2;
+	
+	virtual void Paint(Draw& w) {
+		w.DrawRect(GetSize(), White());
+		w.DrawImage(0, 0, image);
+		w.DrawImage(0, 500, image2);
+		DrawFrame(w, 0, 500, 512, 32, Black());
+	}
+	
+	MyApp() {
+		ImageBuffer ib(512, 32);
+		RGBA *t = ~ib;
+		for(int y = 0; y < 32; y++)
+			for(int x = 0; x < 512; x++)
+				*t++ = GrayColor(x / 2);
+		image2 = ib;
+		image2 = Dither(image2);
+	}
+
+};
+
+GUI_APP_MAIN
+{
+	MyApp app;
+	app.image = Dither(StreamRaster::LoadFileAny(GetDataFile("test.jpg")));
+	app.Run();
+}
diff --git a/upptst/Dither/test.jpg b/upptst/Dither/test.jpg
new file mode 100644
index 000000000..009d2e36f
Binary files /dev/null and b/upptst/Dither/test.jpg differ