4.4.1 and 4.4.2

Again, Kim and I had this action, but looking at this I think we  
should amalgamate these two into:

4.4.1 The user interface never violates the general flash or red  
flash thresholds, or flashes more than three times in any one second  
period (Level A)

Intent of Success Criterion 4.4.1:
The intent of this Success Criterion is to guard against inducing  
seizures due to photosensitivity, which can occur when there is  
general flashing, or red flash. A potentially harmful flash occurs  
when there is a pair of significantly opposing changes in luminance,  
or irrespective of luminance, a transition to or from a saturated red  

Examples of Success Criterion 4.4.1:
A single, double, or triple flash -- as long as it does not include  
changes to or from a saturated red -- may be used to attract a user's  
attention, or as part of an interface animation.

Related Resources for Success Criterion 4.4.1:
ITC Guidance Note for Licensees on Flashing Images and Regular  
Patterns in Television: http://www.ofcom.org.uk/tv/ifi/guidance/ 

Kim and Si.

Received on Thursday, 3 December 2009 09:40:11 UTC