Re: [WSG] color contrast, success criterion 1.4.3

[tee]

 
> 
> 
> Those tools should be accurate for text-only combinations that don't use 
> transparency*, but I don't think they can detect the contents of images. 
> Regardless, if you need something that works absolutely on the final rendered 
> result, try http://www.paciellogroup.com/resources/contrast-analyser.html 
> which gives you an on-screen selector.

Thanks Ben, and others for the suggestions.

> 
> * if you're using alpha transparency i've expanded on that point at 
> http://weblog.200ok.com.au/2009/09/accessibility-vs-alpha-transparency.html
> 

Good article on  using alpha transparency.


Trying to get the site passes SC1.4.3, I have learned something new that I was 
not aware before. The bar is high to building accessible site that needs to 
take all WCAG 2.0 guidelines  :-)

In my case, the site has made fully accessible (except that some part of the 
site cannot work if Javascript switch off) the problem I have had isn't about 
alpha transparency but background images that are not solid colors but gradient 
with blended colors with variation of hues, and each section consists a number 
of blocks that have lighter/darken texts.  I would have thought declaring a 
background color for the outer div wrap, use darken text where lighter 
background area, lighter text for darken background area should take care of 
it. This approach takes care of site performance issue as it reduces extra http 
request, and keeping the layout integrity with text size increases/decreases; 
the way I see it, it's clean, and effective approach. But putting color 
contrast into play, depending on the background color, it will go against 
either darken or lighter foreground color. 

Should  SC1.4.3 not treating the background image as the measurement?

tee

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Re: [WSG] color contrast, success criterion 1.4.3

[Ben Buchanan]

So my question, how accurate is for  Juicestudios Color Contrast Analyser
> and Color Checker Firefox extension? Will the brightness of monitor affect
> the result.
>


Those tools should be accurate for text-only combinations that don't use
transparency*, but I don't think they can detect the contents of images.
Regardless, if you need something that works absolutely on the final
rendered result, try
http://www.paciellogroup.com/resources/contrast-analyser.html which gives
you an on-screen selector.

cheers,

Ben


* if you're using alpha transparency i've expanded on that point at
http://weblog.200ok.com.au/2009/09/accessibility-vs-alpha-transparency.html

-- 
--- 
--- The future has arrived; it's just not
--- evenly distributed. - William Gibson


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Re: [WSG] color contrast, success criterion 1.4.3

[Oliver Boermans]

Hi tee

On 3 May 2010 20:20, tee  wrote:
> I need to pass a site for SC 1.4.3 and I was told some areas (especially link 
> texts) do not passed.
>
>  I ran the site through Juice studios Color Contrast Analyser as well as 
> Color Checker Firefox extension and they fail in some areas that I find 
> suspicious. Example, the site has #333 for body background, but header/footer 
> sections use background images that are much lighter and I am pretty sure the 
> contrast is above 4:5:1
>
> I am not entirely sure if the person who assess the site uses Contrast 
> Analyser to evaluate the site and doesn't taken other factors (e.g. 
> background image)  into account.

It’s not likely to take images into account. Try setting a background
colour in addition to an image eg: background: #fff url(pic.img);

This is good practice regardless to ensure the text is legible when
images are disabled or fail to load for some reason.


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Re: [WSG] color contrast, success criterion 1.4.3

[st...@stevegibbings.co.uk]

Try a standalone contrast checker where you enter your own colour  
codes/numbers. Remember that you need to take into account images may  
be disabled too.


Sent from my iPhone

On 3 May 2010, at 11:50, tee  wrote:

I need to pass a site for SC 1.4.3 and I was told some areas  
(especially link texts) do not passed.


I ran the site through Juice studios Color Contrast Analyser as well  
as Color Checker Firefox extension and they fail in some areas that  
I find suspicious. Example, the site has #333 for body background,  
but header/footer sections use background images that are much  
lighter and I am pretty sure the contrast is above 4:5:1


I am not entirely sure if the person who assess the site uses  
Contrast Analyser to evaluate the site and doesn't taken other  
factors (e.g. background image)  into account.


So my question, how accurate is for  Juicestudios Color Contrast  
Analyser and Color Checker Firefox extension? Will the brightness of  
monitor affect the result.


Thanks!


tee




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[WSG] color contrast, success criterion 1.4.3

[tee]

I need to pass a site for SC 1.4.3 and I was told some areas (especially link 
texts) do not passed.

 I ran the site through Juice studios Color Contrast Analyser as well as Color 
Checker Firefox extension and they fail in some areas that I find suspicious. 
Example, the site has #333 for body background, but header/footer sections use 
background images that are much lighter and I am pretty sure the contrast is 
above 4:5:1

I am not entirely sure if the person who assess the site uses Contrast Analyser 
to evaluate the site and doesn't taken other factors (e.g. background image)  
into account.

So my question, how accurate is for  Juicestudios Color Contrast Analyser and 
Color Checker Firefox extension? Will the brightness of monitor affect the 
result.

Thanks!


tee




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