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RE: Dithering and contrast

From: David MacDonald <befree@magma.ca>
Date: Thu, 25 Jan 2007 15:20:55 -0500
To: "'Sean Hayes'" <Sean.Hayes@microsoft.com>, "'List WAI GL'" <w3c-wai-gl@w3.org>
Message-ID: <001f01c740be$52806aa0$650fa8c0@home>
Hi Sean

 

I used the analyzer tool that the Understanding Doc links to.

 

HYPERLINK
"http://www.wat-c.org/tools/CCA/LCRA/index.html"http://www.wat-c.org/tools/C
CA/LCRA/index.html

 

In my test page HYPERLINK
"http://www.eramp.com/david/general/dithering.htm"http://www.eramp.com/david
/general/dithering.htm

 

I am suggesting they add to the software, an additional algorithm for
dithered images where they sample several pixels and average them rather
than simply forcing the user to choose one pixel. Perhaps that that could be
triggered by a control that says something like “settings for measuring
dithered images”. 

 

I hope that helps

 

David MacDonald

access empowers people...

        ...barriers disable them...

 

HYPERLINK "http://www.eramp.com"www.eramp.com

   _____  

From: Sean Hayes [mailto:Sean.Hayes@microsoft.com] 
Sent: Thursday, January 25, 2007 11:30 AM
To: David MacDonald; 'List WAI GL'
Subject: RE: Dithering and contrast

 

I'm sorry to be coming late to this discussion, but could you provide a
little context, for example perhaps you could explain how you arrive at the
canonical rendering which the contrast analyser is to test.

Sean Hayes
Standards and Policy Team
Accessible Technology Group
Microsoft
Phone: 
  mob +44 7977 455002
  office +44 117 9719730

 

 


   _____  


From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of David MacDonald
Sent: 25 January 2007 03:44
To: 'List WAI GL'
Subject: Dithering and contrast

I had an action item to examine dithering and its relationship to contrast
ratio measurements. 

 

I’ve posted the results of the testing here.

 

HYPERLINK
"http://www.eramp.com/david/general/dithering.htm"http://www.eramp.com/david
/general/dithering.htm

 

David MacDonald

 

access empowers people...

        ...barriers disable them...

 

HYPERLINK "http://www.eramp.com"www.eramp.com

 

 

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Received on Thursday, 25 January 2007 20:21:18 GMT

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