[Gllug] Perl Question - Spam Filter for NMS Form Mail

[Peter Corlett]

On 9 Feb 2009, at 18:35, Henry Gilbert wrote:
> 2009/2/9 Ryan Cartwright <r.cartwright at equitasit.co.uk>:
>> I'm colour blind and certain colour combinations have been known to
>> make me pass out, others can render text completely invisible. I  
>> don't
>> use a screen reader and have otherwise good vision. I would generally
>> view the same site as "the rest" but on some sites I just can't see
>> anything or the colours make me physically sick.
> Could you let me know please which combinations these are?

http://en.wikipedia.org/wiki/Colour_Blindness is worth a gander.

 From that, you can see that red-green is the most common. What this  
means is that you can't get away with colour schemes where the only  
variation is in the red or green colour component. I recall being very  
annoyed with a site that decided to use an orangey-red for the link  
colour and an indistinguishable reddish-orange for the followed-link  
colour, which was the sole way to tell what I'd read in their forum.  
(I've got very poor acuity in red and impaired green.)

> Also what kind of features would help you navigate such sites better?

Don't use colour-coding if it's important that people notice it.  
Provide other visual cues. For example, if you are doing an  
information panel and want to use red/amber/green to indicate status,  
consider using a different font for the label.

> I've been thinking a while about implementing stylesheet switchers and
> so on. But prefer not to implement things without prior experience or
> feedback.


I usually flip between colour and monochrome display when I'm doing a  
colour blindness check. If the contrast is good in both, it's golden.  
This works better if you are actually red-green colourblind :)


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