W3C Guidelines for colour readability:
The brightness difference and colour difference shown
above are based upon the suggested algorithm for good text colour visibility
in the W3C Web Content Accessibility Guidelines,
suggested colour attributes algorithm from the W3C and reproduced in the box on the right.
Brightness differences less than 125 and colour differences less than 500 are supposed to be
not good, though the W3C
algorithm is a suggested algorithm that is ‘still open to change’ and that’s no bad thing,
seeing as how it’s wrong. On FOUR counts is it wrong. Do these researchers never test anything?
Points versus pixels:
I use type measurements in points (1/72nd of an inch). Some prefer pixels and some prefer
relative measurements. The problem with pixels is that type will be a different size depending on the resolution of your
monitor, whereas with points the type size should stay consistent from monitor to monitor – I expect that it doesn’t always, in fact,
but it’s about the best that we can do.
† The fonts in the dropdown list are the Microsoft fonts
that many machines have. Currently this page is not set up to know what fonts actually are on your machine, but it will try setting a font
that you type the name of (in the box that follows ‘or †’ and after you click ‘Set’). If you click
‘Set’ when the box is blank, the Microsoft font from the dropdown list will be used. If a font you select or type
isn’t present, probably the font will be changed to your machine’s default font – that’s what seems to happen.
Thanks for your attention. Please keep tuning in to the site as it gets honed and developed periodically. Welcome.