The document summarizes a subjective study that assessed how color information influences human visual quality judgments of compressed high-resolution images. Test subjects rated the quality of original images and their compressed versions, either as color images or with just luminance. Results showed a relevant difference in perceived quality between the two conditions, with luminance-only ratings being more optimistic. This suggests objective quality metrics should account for color to better correlate with subjective human judgments. The study provides evidence that color information is important for visual quality assessment.

1. Subjective study of the influence of color information on visual quality assessment of high resolution pictures Francesca De Simone a , Frederic Dufaux a , Touradj Ebrahimi a , Cristina Delogu b , Vittorio Baroncini b a École Polytechnique Fédérale de Lausanne, Switzerland b Fondazione Ugo Bordoni, Italy

3. Introduction

8. Proposed test methodology

13. Test material selection

18. Results

21. Results for image 09 Coding complexity level = 1 (simple)

22. Results for image 12 Coding complexity level = 2

23. Results for image 23 Coding complexity level = 3

24. Results for image 17 Coding complexity level = 4 (difficult)

25. Conclusions

27. Thank you for your attention! Questions?