Comment 4 for bug 354018

I agree with Fred but I would also like to point out that perceived
contrast is relative because each user/viewing conditions scenario is
unique. Absolute contrast is not hard to define look at the positions
of the two colours in a colour sphere with the centre being mid grey.
The contrast is the length of the line between the colours, across the
colour space. If you take this definition of contrast you can then
define high, average and low contrast ranges. Once you have your
ranges defined you can use code to check a theme and produce variants
that fall into different ranges. You just move the colour along the
vector defined by their original positions in the colour space.

The benefit of this system is that the artist gets to judge their
design by aesthetic rules but the theme is also parametric and can be
morphed to fit different scenarios.

On Fri, Apr 3, 2009 at 10:34 AM, Fred <email address hidden> wrote:
> Well for me usability includes reasonable contrasts so you can
> distinguish the bar/train in the scrollbar from the scroll-track/rail.
>
> If it looks like a soup with poor contrast, then its difficult to
> distinguish, and then it has poor usability, I think.
>
> --
> Lack of contrast in scrollbar results in poor usability
> https://bugs.launchpad.net/bugs/354018
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