What do you see in a digital color dot picture such as the Ishihara pseudo-isochromatic plates? Web Accessibility Palette (WAP)

Yasuyo G. Ichihara

doi:10.1117/12.411916

27 December 2000 What do you see in a digital color dot picture such as the Ishihara pseudo-isochromatic plates? Web Accessibility Palette (WAP)

Yasuyo G. Ichihara

Author Affiliations +

Proceedings Volume 4311, Internet Imaging II; (2000) https://doi.org/10.1117/12.411916
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

Internet imaging is used as interactive visual communication. It is different form other electronic imaging fields because the imaging is transported from one client to many others. If you and I each had different color vision, we may see Internet Imaging differently. So what do you see in a digital color dot picture such as the Ishihara pseudoisochromatic plates? The ishihara pseudoisochromatic test is the most widely used screening test for red-green color deficiency. The full verison contains 38 plates. Plates 18-21 are hidden digit designs. For example, plate 20 has 45 hidden digit designs that cannot be seen by normal trichromats but can be distinguished by most color deficient observers. In this study, we present a new digital color pallette. This is the web accessibility palette where the same information on Internet imaging can be seen correctly by any color vision person. For this study, we have measured the Ishihara pseudoisochromatic test. We used the new Minolta 2D- colorimeter system, CL1040i that can define all pixels in a 4cm x 4cm square to take measurements. From the results, color groups of 8 to 10 colors in the Ishihara plates can be seen on isochromatic lines of CIE-xy color spaces. On each plate, the form of a number is composed of 4 colors and the background colors are composed of the remaining 5 colors. Normal trichromats, it is difficult to find the difference between the 4 color group which makes up the form of the number and the 5 color group of the background colors. We also found that for normal trichromats, colors like orange and red that are highly salient are included in the warm color group and are distinguished form the cool color group of blue, green and gray. Form the results of our analysis of the Ishihara pseudoisochromatic test we suggest the web accessibility palette consists of 4 colors.

Citation Download Citation

Yasuyo G. Ichihara "What do you see in a digital color dot picture such as the Ishihara pseudo-isochromatic plates? Web Accessibility Palette (WAP)", Proc. SPIE 4311, Internet Imaging II, (27 December 2000); https://doi.org/10.1117/12.411916

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available