Jan-Olof Eriksson
Randall R Schulz kirjoitti:
On Sunday 15 June 2008 02:17, Jan-Olof Eriksson wrote:
Rajko M. kirjoitti:
On Sunday 15 June 2008 01:36:57 am Jan-Olof Eriksson wrote:
If its disabled, how can i enable it? http://opensuse-community.org/FAQ get used to look there for missing parts. Ok, tested it, looks absolutely horrible. Do you have instructions to uninstall that? :D
Are you saying sub-pixel hinting looks horrible? 'Cause if you are, it's because you haven't reconfigured your fonts properly. And, of course, it's only pertinent to begin with for LCD displays.
I tryed this again. I dont get it, i have LCD screen and fonts look green-black-red mixture, does anyone know why? I use freetype package from M17N -repo.
I tried to explain this, but maybe I couldn’t express it clearly.
The wikipedia article about the subject
http://en.wikipedia.org/wiki/Subpixel_rendering
is a good introduction to understand what sub-pixel hinting is and
what it is supposed to achieve.
Of course this works only as intended, if the calculation of the colour
values used is done in a way which is suitable for the properties of the
screen. If wrong colour values are used, sub-pixel hinting will not have
the effect of increasing the apparent resolution. To the contrary, it
will make you see colours around the glyphs which can be very annoying.
For example, let’s assume that you set your sub-pixel hinting to VRGB in
your fontconfig setup (or use the KDE or Gnome Gui for that) and your
screen is not VRGB (red, green, and blue sub-pixels arranged vertically)
but it is RGB (red, green, and blue pixels arranged horizontally).
Then the calculation which pixels should show which colour to switch on
the desired sub-pixels with the desired intensity will get completely
wrong results which are just wrong for that screen. The result is that
the rendering will look worse instead of better.
The same happens if gamma correction isn’t done right.
There is also a wikipedia article about gamma correction:
http://en.wikipedia.org/wiki/Gamma_correction
If this is not done right, the pixels will end up luminating with wrong
intensity values which makes you see different colours than intended.
In my perception, doing sub-pixel hinting with wrong gamma correction
looks worse than doing no sub-pixel hinting at all.
If it is done right, I can barely notice that there are colours around
the glyphs, only if I use a magnification tool like “xmag” I can clearly
see the colours. But if the calculation of the colours and/or
intensities is very wrong, I can see the colours around the glyphs
without using any special tool with my naked eyes 1 meter away from
the monitor. This cannot be correct, this just looks bad.
This is the “green-black-red mixture” you described above.
--
Mike FABIAN