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Re: How to wreathe crescendo ?


From: Francisco Vila
Subject: Re: How to wreathe crescendo ?
Date: Wed, 2 Mar 2011 10:57:46 +0100

2011/3/1 tobias bora <address@hidden>:
> When I say "How can we wreathe crescendo ?" I would like to have not many
> little horizontal lines but two diagonals line.

We all desire this, but it's impossible.  Let me explain.

Your computer display consists of a rectangular matrix of pixels.
Laser printers also dump to a paper a fine grain, rectangular matrix
of black dots.  Hairpins and other diagonal lines could be diagonal in
concept, but they need to be rendered to a screen or onto a paper for
you to be able of seeing it.  LilyPond output to PS/PDF is vectorial,
i.e. it keeps the 'concept' of a diagonal line, but your output device
has to convert those vectorial commands to the dot matrix of said
device.  Many tricks can be applied to achieve this: antialias (gray
dots at borders) on screen, RET on laser printers and variable-size
ink drops on inkjet printers.

Above all, low-resolution output devices ruin all this effort, for
example, a monochrome small-sized gif image.  That's why you see many
little horizontal lines instead of diagonals. What you can do to
smooth diagonal lines (and circles, etc) is:  a) use a high-resolution
output device.  The bigger the image, the better.  b) never use
monochrome gif images (no antialias, no gray dots), use grayscale with
a good bit depth.

Printed material is commonly made with very high-resolution renderers.
 I don't know exactly: ten thousand dots per inch?  Maybe not that
much, but high enough so you can not see the 'stairs'.

-- 
Francisco Vila. Badajoz (Spain)
www.paconet.org , www.csmbadajoz.com



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