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Re: GIFs

From: Roberts, Elizabeth A. <ROBERTS@hfsecmail.rdh.ohio-state.edu>
Date: Fri, 28 Mar 2003 15:32:47 -0500
To: "'w3c-wai-ig@w3.org'" <w3c-wai-ig@w3.org>
Message-id: <78E26E40136B4046B433F081D1B7DA4329C71B@hfsecmail1.rdh.ohio-state.edu>

Vincent Flanders wrote:
> I haven't examined every accessibility verification tool out there, but 
> it seems rather strange to me the ones I've looked at want me to 
> manually examine each GIF file for flicker. Even *I* know that it's 
> possible for a programmer to examine the contents of a GIF file and tell 
> if it's animated. Are there any accessibility tools out there that check 
> the GIFs for you and eliminate the ones that obviously aren't animated?

This is slightly different, but closely related: Deque
<http://www.deque.com/> creates a product called RAMP that detects
unacceptable flicker rates and fixes them.

From <http://www.deque.com/products/rampsection508.htm>:

"Section 508 Paragraph (j) Pages shall be designed to avoid causing the
screen to flicker with a frequency greater than 2 Hz and lower than 55 Hz.

"Automatically detects flickering rates with unacceptable frequency
Auto Remediation of animated gifs, marquee elements, and other blinking

I just happened to go to a product demonstration recently, but haven't had a
chance to test it out for myself; they did use the product to change a gif
during the demonstration and it seemed to work well.

--Liz Roberts
Received on Friday, 28 March 2003 15:32:50 UTC

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