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RE: CLOSED: Issue #344

From: Gregg Vanderheiden <gv@trace.wisc.edu>
Date: Tue, 13 Dec 2005 10:29:27 -0600
To: <w3c-wai-gl@w3.org>
Message-ID: <002401c60002$62ae4300$8c17a8c0@NC6000BAK>


We looked at lightness (L) as part of our work.  We found that, depending on
the values you choose, you end up with comparable results to the algorithm
proposed.   The one we proposed however seemed to perform better at lower
black end.   I will forward comparisons - though it is a bit involved since
they didn't specify what the threshold values should be. 

The key to either approach would be to define the threshold values.  The
link you pointed to provides an equation but no values for the threshold.
Further, the tests to date have only been carried out on subjects without
vision impairments.   They are hypothesizing research with people who have
vision deficits but there has been none to date.   If we were to use this in
our guidelines (which is a possibility) we would need to have values for the
threshold within the next 3 months.   What values would they propose for
level 2 and 3?   What would it be based on?    Could they come up with them
within the next month?

 -- ------------------------------ 
Gregg C Vanderheiden Ph.D. 
Professor - Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 

-----Original Message-----
From: w3c-wai-gl-request@w3.org [mailto:w3c-wai-gl-request@w3.org] On Behalf
Of Roberto Scano (IWA/HWG)
Sent: Tuesday, December 13, 2005 10:05 AM
To: chris.ridpath@utoronto.ca; gv@trace.wisc.edu; w3c-wai-gl@w3.org
Subject: Re: CLOSED: Issue #344

Here is it:

----- Messaggio originale -----
    Da: "Chris Ridpath"<chris.ridpath@utoronto.ca>
    Inviato: 13/12/05 16.45.40
    A: "Roberto Scano (IWA/HWG)"<rscano@iwa-italy.org>,
    Oggetto: Re: CLOSED: Issue #344
    Thanks for the information. I agree with Gez that it looks sensible and 
    > Hi, there is also the italian algorithm proposed in the list.
    Roberto - Sorry I couldn't find it. Could you provide a link?

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Received on Tuesday, 13 December 2005 16:29:42 UTC

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