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Situation B: Colors for stacked bar chart

From: <noreply@w3.org>
Date: Wed, 17 Aug 2011 16:52:19 +0000
To: public-comments-wcag20@w3.org
Message-Id: <E1QtjLn-0002ki-M0@lowblow.w3.org>

Name: Makoto Ueki
Email: makoto.ueki@gmail.com
Affiliation: WAIC (Japan)
Document: UW
Item Number: Understanding Success Criterion 1.4.1
Part of Item: Intent
Comment Type: question
Summary of Issue: Situation B: Colors for stacked bar chart
Comment (Including rationale for any proposed change):
Will SC 1.4.1 be applied to a stacked bar chart?

For example, a stacked bar chart shows two items by using two different colors. There are the graph legends near the chart which explains what is represented by each bar and color. The patterns are not used.

It might depend on the colors used in the chart. If the colors are black and white, will SC 1.4.1 be applied to the image of the stacked bar chart?

In that case, the color differences are used to convey information within non-text content. However the patterns are not necessarily needed to convey the same information in a manner that does not depend on color. Because black and white has sufficient contrast ratio and brightness difference. 

Does SC 1.4.1 require the authors to include patterns to any combination of colors?

If yes, could you explain the reason why the patterns are needed for black and white?

Proposed Change:
Need an answer from WCAG WG in order to harmonize JIS and WCAG 2.0.
Received on Wednesday, 17 August 2011 16:52:23 UTC

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