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An automated tool that can identify flicker in animated GIF

From: Roberto Ellero <rellero@webaccessibile.org>
Date: Wed, 6 Jul 2005 19:10:03 +0200
Message-ID: <002b01c5824d$8e51b7e0$0200a8c0@acer2bfda75bdc>
To: <w3c-wai-gl@w3.org>
Cc: "Renzo Giust | CrossCode" <renzo.giust@crosscode.it>

Hi,
in webaccessibile.org is now available the english version of an automated
tool that can identify flickering in animated GIF:

http://www.webaccessibile.org/test/check.aspx

In the Draft of the Ministerial Decree containing the Technical Rules of Law
4/2004 there is a requirement (n. 5, page 12 of the english translation:
http://www.pubbliaccesso.it/english/index.htm) that requires to avoid
flickering or moving objects or text with an intermittent frequency could
cause photosensitive epileptic seizures or disturb concentration, or could
cause the assistive technology used to malfunction. WCAG 1.0 References:
7.1, 7.2, 7.3 Sec. 508 References: 1194.22 (j)

The tool, developed by Ing. Renzo Giust (IWA/HWG), checks a single image
or a page, even with the setting of background color for transparent GIF,
and the output is a detailed report with frame list, Length (ms) Rate (Hz),
unacceptable flicker rate and a graphic rendering of Contrast / Rate
variation (calculation based on Ridpath method, W3C algorithm, with a
variation: the range for color brightness difference is 62,5, for color
difference is 250).

Best regards,
Roberto Ellero


P.S.: We are searching for translations in other languages, so contact me
for collaborate with us.
Received on Wednesday, 6 July 2005 17:10:11 GMT

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