Original and a greyscale from CIE luminance

8x magnification - greyscale

DDT method (8 passes using yms optimisation)

8x magnification - colour

DDT method (8 passes using yms optimisation)

DDT method (3 passes using yms optimisation)

Photo from a recent shuttle mission

zoomed section original

4x magnification using gimp

DDT method (8 passes using yms optimisation

A simple example

Original

My implementation

Gimp version

Another edge-directed algorithm on the same image

	Name	Last modified	Size	Description
	Parent Directory		-
	t/	2010-03-30 20:10	-
	imagefilt-rob.tar.gz	2003-01-06 13:57	37K
	flowerg-gimp.png	2002-06-25 21:53	50K
	thigh2.png	2002-06-12 11:40	284K
	thigh.png	2002-06-12 11:39	306K
	truck.png	2002-06-11 07:30	224K
	truck-yms-8pass.txt	2002-06-11 07:13	340
	truck-distance-8pass..>	2002-06-11 07:13	340
	truck-distance-8pass..>	2002-06-11 07:13	681
	flow.png	2002-06-09 21:35	53K
	flowerg.png	2002-06-09 21:35	8.9K
	s110e5004.jpg	2002-06-08 15:52	1.4M
	s110-zoom.png	2002-06-08 15:50	247K
	s110-zoom-gimp4.png	2002-06-08 15:50	1.8M
	s110-zoom-ddt.png	2002-06-08 15:48	2.1M
	lisa-scale14.png	2002-06-08 15:16	349K
	lisa-gimp8.png	2002-06-08 14:51	310K
	lisa-scale12.png	2002-06-08 14:48	19K
	lisa-scale11.png	2002-06-08 14:46	763K
	lisa-gimp8c.png	2002-06-08 14:32	710K
	lisa-scale10.png	2002-06-08 14:32	762K
	lisa-scale7.png	2002-06-08 13:03	398K
	lisa.png	2002-06-08 12:14	34K
	lisa-scale5.png	2002-06-08 12:14	415K
	lisa-scale4.png	2002-06-08 12:13	62K
	costfunc.png	2002-05-30 21:10	3.4K