Dear Bill
That is better.
It will be quite easy to look for one rectangle filled with a dark colour and 
then click on it.
73 de G4SWY Derek +++



    On Tuesday, 30 April 2019, 14:33:34 BST, Bill Somerville 
<g4...@classdesign.com> wrote:  
 
  On 30/04/2019 14:17, Bill Somerville wrote:
  
 On 30/04/2019 14:09, Tom Ramberg via wsjt-devel wrote:
  
As for colour blindness, red and green are the absolute worst alternatives for 
us that are affected. (10% of male population). 
  73 de Tom OH6VDA  Sendt fra min iPad Air 2   
 
Hi Tom,
 
I agree but I have not come across a pair of colours that widely imply stop/go, 
bad/good, reject/accept, ... conceptually and that are visible to those with 
red-green colour blindness.Any suggestions?
 
73
 Bill
 G4WJS.
 
 
Hi Tom,
 
here is a good summary from the UX perspective:
 
https://uxplanet.org/using-red-and-green-in-ui-design-66b39e13de91?gi=4879d577a25a
 
perhaps the most useful information I can take from that is maybe using just 
one colour for the OK button is a better approach and make that green. Then at 
least those with red-green colour blindness can learn that the brown looking 
button is the OK button. Like this:
 

 
73
 Bill
 G4WJS.
 
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