Volume dial contrast

[Thomas Lübking]

Am Tuesday 23 March 2010 schrieb Thomas Pfeiffer:
> Hi all,
> when looking at the new toolbar and playing with the volume dial a bit, I
> noticed that especially in dark color schemes, the blue rim indicating the
> current volume is hardly visible at all (see attached screenshot). With
> only the changing volume icon as the only really visible indicator for the
> current volume. it is hard to set it precisely.

> Could it be made a little thicker to improve visibility?
This won't help much. The problem is not so much the absolute contrast between 
the slider and the dark background (nor the white icon) but the dominant 
contrast between the background and the white part of the icon.

The solution would be to invoke* the background color and (partially**) 
"invert" the icon.

I'll play around on the svg a bit.

* unfortunately that means to either make it always brighter or always darker 
or keep the background color (meaning to de-emphasize it...) - unless we use 
different icons for dark and bright backgrounds
** i'd prefer to add a halo that supports the inner icon in dark surroundings, 
but that's still inkscape exclusive :'(