On Sun, 20 Mar 2005, Dik Takken wrote:
> > My experience has been to use no lines thinner than 4 pixels, preferably
> > 6 pixel and to use a bold or semi-bold sans serif font.
>
> So that reduces the safely usable resolution down to 144 vertical PAL
> pixels? I know I have seen plenty of TV commercials that contain still
No, it reduces the usable resolution down to 144 vertical *lines*
each 4 pixels tall. Well, a bit less since there will be some space
between the lines ;)
> pictures with serif fonts and lines that look very sharp (sharper than
> the 144 pixel res allows, I think), and yet they do not flicker, at least
> not noticeably. How do they do that?
My hunch is that they carefully selected a font size that made sure
no lines were less than 4 pixels.
> ...movies often do contain serif fonts (during the introduction of the movie
> for instance), small fonts and logo's with thin lines in them (end
> credits). All of these things look detailed and quite flicker-free on a TV
I think the font and pointsize are carefully chosen to minimize the
flickering problem.
An interesting experiment would be to extract some stills from a DVD
and examine the images with the GIMP or other tool and see how many
pixels the characters take.
Cheers,
Steven Schultz
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