The following images show the results of our adaptive QR algorithm based image dithering research (G. Bozkurt, Y. Yardimci, O. Arikan, A. E. Cetin, `QR-RLS algorithm for error diffusion in color images,' {\em IEEE International Conference on Image Processing (ICIP-98)}, Oct. 1998).
Minnesota Image - 8 Levels Quantization
Minnesota Image - 16 Levels Quantization
Boats Image- 8 Levels Quantization
Boats Image - 16 Levels Quantization
Zelda Image- 16 Levels Quantization
Sunset Image- 16 Levels Quantization
The above images are JPEG compressed (with '95% quality'). We found no visual difference between the originals and the compressed images. Please send me an e-mail if you want to see the original images.