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Re: Color Contrast (Minimum) Level AA requirement for "Photography" image

From: Userite <richard@userite.com>
Date: Fri, 29 Sep 2017 10:10:24 +0100
Message-ID: <303287AD4A3049D584651C9A25DB108B@RichardPC>
To: "Subramanian, Poornima \(PCL\)" <psubramanian@hagroup.com>, <w3c-wai-ig@w3.org>
Dear Poornima,

The image that you are using is a photo of a brochure that exists in the physical world. You do not need to make any changes to the image as it shows the real thing.  You DO NOT need to change the image at all to make it accessible.  What you do need to do is include an alternative text attribute to the code that loads the image so that makes the photo accessible. 

A suitable text alternative would be “Summer Caribbean holiday brochure”.  The fact that the brochure text is not complying with the guideline is not relevant in this case.  You are showing your visitor what the brochure looks like so they can recognise it in a shop.  The image is not being used to present textual information.  You should write the text on the brochure elsewhere on the page if you want users to know what the brochure text says.

Guideline 1.4.3 refers to when you make an image of text that you then want to use to impart information.  For example if I want to have a fancy “Welcome” message at the top of my page then I can make an image of the word “Welcome” using Photoshop with some really exciting font effects.  In this case I need to employ good colour contrast because I want the visitor to be able to read the message and feel welcome.   What your image is showing is a brochure, not textual information.

Remember that the guidelines are just guidelines.  You need to make a value judgement as to what guideline is relevant.  To do this you should read and understand the supporting documentation.  If you go to https://www.w3.org/TR/2005/WD-UNDERSTANDING-WCAG20-20051123/Overview.html#visual-audio-contrast10 for information about 1.4.3 and you will see that it is not relevant in your case.

I hope that helps you and saves you a lot of worry.

Kind regards

Technical Manager

From: Subramanian, Poornima (PCL) 
Sent: Thursday, September 28, 2017 4:17 PM
To: Chaals McCathie Nevile ; w3c-wai-ig@w3.org 
Subject: RE: Color Contrast (Minimum) Level AA requirement for "Photography" image

Great, here's my question -

In our application, there are brochure images which are actually the "photography of cover page" in JPEG format. Though they are photography images, it has large amount of text in it which does not meet minimum color contrast ratio.

Attached image is a sample brochure.

I find the below NOTE for the WCAG Reference: 1.4.3 Contrast (Minimum): The visual presentation of text and images of text has a contrast ratio of at least 4.5:1

“Note: Images of text do not scale as well as text because they tend to pixelate. It is also harder to change foreground and background contrast and color combinations for images of text, which is necessary for some users. Therefore, we suggest using text wherever possible, and when not, consider supplying an image of higher resolution.”

Can you please look and advise if the "color contrast” on this image is required to make this image compliant? Or increasing the resolution of image alone will be sufficient?

Your suggestions, please?

Accessibility Tester & Consultant

-----Original Message-----
From: Chaals McCathie Nevile [mailto:chaals@yandex.ru] 
Sent: Thursday, September 28, 2017 10:42 AM
To: w3c-wai-ig@w3.org
Subject: Re: Color Contrast (Minimum) Level AA requirement for "Photography" image

On Thu, 28 Sep 2017 15:54:42 +0200, Subramanian, Poornima (PCL) <psubramanian@hagroup.com> wrote:

> I would like to ask the team on one specific scenario for ‘Color 
> Contrast’ requirement. Please advise if this is the right >forum to 
> ask such questions.

This is a perfectly reasonable forum to ask such questions.


Chaals is Charles McCathie Nevile
find more at http://yandex.com

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Received on Friday, 29 September 2017 11:09:02 UTC

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