What does my web site look like to a colorblind visitor?

Thanks to the "Mining Amazon Web Services" book, I cam across this cool web site that simulates how your web page may look to a color blind visitor - it's at http://www.visicheck.com.

Here's a page about our "Of Course" newsletter as it would be seen by people with three different forms of colourblindness.






From top left.
Deuteranope - a form of red / green colour blindness
Protanope - another form of red / green color blindness
Tritanope - a rare blue / yellow deficiency
Control - the web site as seen by a user with regular vision

Note - these images are available larger. Simply click on an image with the right button (use CTRL-mouse on a Mac) and view the image in a new window.

Note - please use these images for guidance only. We suggest you look at the vischeck site and read their disclaimers and comments carefully.

In the UK, The Disability Discrimination act requires that providers of services take reasonable steps to make those services as accessible to those with any form of disability as they are to people without the disability. We have a training module available on the subject (it's available for free download as a .pdf too. As well as other DDA subjects (such as font sizes), this module also introduces the UK' privacy and data protection laws and a number of other topics you should be aware of.
(written 2005-04-22, updated 2006-06-05)

 A213 - Web Application Deployment - Commercial and Legal Aspects
  [3168] Web Sites - Subject to Advertising Standards from 1st March - check your sites - (2011-02-13)
  [3104] Catering in Syracuse, the Saigon Cafe, stolen images and Christmas - (2010-12-25)
  [3016] The legal considerations of your web presence - revisited - (2010-10-26)
  [2686] Freedom of Information - consideration for web site designers - (2010-03-20)
  [2592] Re-using our pictures - (2010-01-21)
  [2252] Leaping dog, Leaping horse, copyright of old masters - (2009-06-20)
  [2140] Beware - giving copyright away when you upload a picture - Dogs Trust - (2009-04-25)
  [1937] Getting hold of the wrong end of the stick - (2008-12-12)
  [1840] Validating Credit Card Numbers - (2008-10-14)
  [1747] Who is watching you? - (2008-08-10)
  [1506] Ongoing Image Copyright Issues, PHP and MySQL solutions - (2008-01-14)
  [1486] Does anyone understand Lithuanian? - (2007-12-27)
  [1485] Copyright and theft of images, bandwidth and members. - (2007-12-26)
  [1431] Getting the community on line - some basics - (2007-11-13)
  [1054] UK legal requirements for your commercial web site - (2007-01-27)
  [994] Training on Cascading Style Sheets - (2006-12-17)
  [876] Making pages clearer - easy Disability Discrimination Act Compliance - (2006-09-23)
  [795] Remember a site's non-technical issues too - (2006-07-07)
  [759] Watch your Google profile - (2006-06-13)
  [746] Domain Listing Center and Domain Registry of America - (2006-06-06)
  [532] Copyright - how much can I legally copy? - (2005-12-17)
  [322] More maps - (2005-05-23)
  [320] Ordnance Survey - using a 'Get a map' - (2005-05-22)
  [259] Responding to spam - (2005-03-27)
  [142] Colour for access - (2004-12-06)

G902 - Well House Consultants - Web site techniques, utility and visibility
  [3589] Promoting a single one of your domains on the search engines - (2012-01-22)
  [3563] How big is a web page these days? Does the size of your pages matter? - (2011-12-26)
  [3554] Learning more about our web site - and learning how to learn about yours - (2011-12-17)
  [3532] Sharing the user experience - designing a form with the customer in mind - (2011-11-29)
  [3491] Who is knocking at your web site door? Are you well set up to deal with allcomers? - (2011-10-21)
  [3426] Automed web site testing scripted in Ruby using watir-webdriver - (2011-09-09)
  [3367] Google +1 - what is it? - (2011-07-22)
  [3197] Finding and diverting image requests from rogue domains - (2011-03-08)
  [3149] Looking back at www.wellho.net - (2011-01-28)
  [3087] Making the most of critical emails - reading behind the scene - (2010-12-16)
  [3022] Retaining web site visitors - reducing the one page wonders - (2010-10-31)
  [2981] How to set up short and meaningfull alternative URLs - (2010-10-02)
  [2668] Is it worth it? - (2010-03-09)
  [2569] How to run a successful online poll / petition / survey / consultation - (2010-01-10)
  [2552] Web site traffic - real users, or just noise? - (2009-12-26)
  [2532] Analysing Google arrivals by country of origin - (2009-12-10)
  [2519] Status Page / breaks of service in early December - (2009-11-30)
  [2410] Removal of technical resources from this site - (2009-09-19)
  [2389] Writing with our customers words - (2009-09-01)
  [2341] Koulutus, Open Source tietokone kielillä - (2009-08-09)
  [2340] ldning, Open Source dator språk - (2009-08-09)
  [2339] Opplæring, Open Source datamaskinen språk - (2009-08-09)
  [2338] Uddannelse, Open Source computer sprog - (2009-08-09)
  [2337] Opleiding, Open Source computertalen - (2009-08-09)
  [2336] Formação, Open Source computador línguas - (2009-08-09)
  [2335] Ausbildung, die Open-Source-Sprachen - (2009-08-09)
  [2334] Formazione, Open Source computer lingue - (2009-08-09)
  [2333] Formación, de los lenguajes de código abierto - (2009-08-09)
  [2332] Formation, des langages Open Source - (2009-08-09)
  [2225] How important is a front page ranking on a search engine? - (2009-06-09)
  [2065] Static mirroring through HTTrack, wget and others - (2009-03-03)
  [2056] Web Site Loading - experiences and some solutions shared - (2009-02-26)
  [1982] Cooking bodies and URLs - (2009-01-08)
  [1970] Plagarism - who is copying my pages? - (2009-01-02)
  [1961] Making our things easier to find - (2008-12-26)
  [1955] How to avoid duplicating web page maintainance - (2008-12-20)
  [1888] Find the link - (2008-11-16)
  [1856] A few of my favourite things - (2008-10-26)
  [1833] Web Bloopers - good form design - avoiding pitfalls - (2008-10-11)
  [1797] I have been working hard but I do not expect you noticed - (2008-09-14)
  [1793] Which country does a search engine think you are located in? - (2008-09-11)
  [1756] Ever had One of THOSE mornings? - (2008-08-16)
  [1711] Rapid growth leads to server move - (2008-07-17)
  [1653] How do Google Ads work? - (2008-05-25)
  [1634] Kiss and Book - (2008-05-07)
  [1630] To provide external links, or not? - (2008-05-04)
  [1610] PHP course dot co, dot uk - (2008-04-13)
  [1554] Online hotel reservations - Melksham, Wiltshire (near Bath) - (2008-02-24)
  [1541] Colour, Composition or Content - (2008-02-16)
  [1534] Where in the world / country is my visitor from? - (2008-02-07)
  [1513] Perl, PHP or Python? No - Perl AND PHP AND Python! - (2008-01-20)
  [1505] Script to present commonly used images - PHP - (2008-01-13)
  [1494] A time to update pictures - (2008-01-03)
  [1437] Above the fold with First Great Western - (2007-11-19)
  [1297] Stuffing content into a web page - easy maintainance - (2007-08-09)
  [1237] What proportion of our web traffic is robots? - (2007-06-19)
  [1212] What brought YOU to our web site? - (2007-06-01)
  [1207] Simple but effective use of mod_rewrite (Apache httpd) - (2007-05-27)
  [1198] From Web to Web 2 - (2007-05-21)
  [1186] Two new pages / sites - (2007-05-14)
  [1184] Finding resources - some pointers - (2007-05-13)
  [1177] Sorting out for a site map - (2007-05-05)
  [1104] Drawing dynamic graphs in PHP - (2007-03-09)
  [1055] Above the fold - (2007-01-28)
  [1029] Our search engine placement is dropping. - (2007-01-11)
  [1015] Search engine placement - long term strategy and success - (2006-12-30)
  [976] Santa at the station - (2006-12-09)
  [916] Driving customers away - (2006-11-07)
  [893] Visibility - (2006-10-14)
  [800] Effective web campaign? - (2006-07-12)
  [767] Finding the language preference of a web site visitor - (2006-06-18)
  [757] Horse and Python training - (2006-06-12)
  [732] Where is a web site visitor browsing from - (2006-05-24)
  [718] Protecting images from theft - (2006-05-12)
  [681] Mirroring a dynamic site - (2006-04-12)
  [658] Keeping the visitors happy and browsing - (2006-03-26)
  [649] Denial of Service ''attack'' - (2006-03-17)
  [533] Bigger Box Campaign - (2005-12-18)
  [528] Getting favicon to work - avoiding common pitfalls - (2005-12-14)
  [510] Dynamic Web presence - next generation web site - (2005-11-29)
  [492] New Navigation Aid - Launch of My Wellho - (2005-11-11)
  [414] Form Madness - (2005-08-14)
  [376] What brings people to my web site? - (2005-07-13)
  [369] CMS - the minefield of Choices - (2005-07-05)
  [348] Graveyard pages - (2005-06-15)
  [347] Frightening and from-friend viruses and spams - (2005-06-14)
  [314] What language is this written in? - (2005-05-17)
  [311] Growth pains - (2005-05-14)
  [284] The Iconish language - (2005-04-19)
  [278] Cover all the options - (2005-04-13)
  [276] An apology to Mr Boneparte - (2005-04-11)
  [274] Our most popular resources - (2005-04-10)
  [268] Information request forms, cleaning up spam - (2005-04-05)
  [261] Putting a form online - (2005-03-29)
  [222] Who are all these visitors? - (2005-02-20)
  [202] Searching for numbers - (2005-02-04)
  [197] Allow for peak traffic on your web site - (2005-02-01)
  [182] Your personal Google ranking - (2005-01-19)
  [179] The hunt for unique words - (2005-01-16)
  [173] Data Mining - (2005-01-09)
  [165] Implementing an effective site search engine - (2005-01-01)
  [117] A case of case - (2004-11-14)
  [109] URLs - a service and not a hurdle - (2004-11-04)
  [98] No more 'Error 404' pages. Something better. - (2004-10-24)
  [32] Web design platoon - (2004-08-29)
  [23] Skills and responsibilities - (2004-08-22)

W512 - Web and Intranet - Site Design Aspects
  [3517] Tags used in writing this blog - (2011-11-12)
  [2214] Global Index to help you find resources - (2009-06-01)
  [1598] Every link has two ends - fixing 404s at the recipient - (2008-04-02)
  [1353] Mood shots - (2007-09-16)
  [1047] Maintainable code - some positive advice - (2007-01-21)
  [918] Databases needn't be frightening, hard or expensive - (2006-11-08)
  [859] Put the answer in context - it may be printed - (2006-09-08)
  [823] An excellent use for a visitor count? - (2006-08-05)
  [556] Colour doesn't have to mean colourful - (2006-01-06)
  [391] One mans pleasure is another mans poison - (2005-07-26)
  [352] Improved mining techniques! - (2005-06-19)
  [345] Spotting a denial of service attack - (2005-06-12)
  [319] Accommodation and landing pages - (2005-05-21)
  [229] A fortunate accident - (2005-02-27)

Back to Checking that all our servers are up and accessible

Previous and next or Horse's mouth home

Forward to MP for Devizes, Wiltshire

Elegant languages - Perl, PHP, Python
Why are we no. 404
Object Orientation in Tcl - [incr-Tcl]
MP for Devizes, Wiltshire
Colour blindness for web developers
Checking that all our servers are up and accessible
Automating regular manual procedures
What career opportunities for web designers
Natural or man-made?