[smufl-discuss] Re: Registration of rests

[Emil B. Wojtacki]

Daniel Spreadbury wrote:

> Joe wrote:
>
>> RESTS
>>> In fact, Petrucci and Opus have rests centred on the font baseline
>>> (so I did not propose anything new) with exception for semibreve
>>> rest, which is placed one space higher. ...
>> Based on the comments so far, I'm agreeing that perhaps we need to
>> move away from totally uniform registration of all rests and
>> explicitly state that the semibreve rest is registered relative to
>> the line from which it hangs, not the center line of an imaginary staff.
> The rests in Opus and Petrucci aren't really centered on the baseline, are
> they? Here they all are:
>
> ...
>
> Obviously Opus and Petrucci are consistent, and Sonata is more or less
> consistent but offset by half a space. However, the registration of these
> symbols doesn't really help scoring applications draw the rests in the
> right place. Take a look at the default positions of rests in Sibelius and
> Finale on a 5-line staff and a 1-line staff:

Thanks for the images. I referred to the most frequent ones
(minim-demisemiquaver), which _are_ centred (i.e. positioned so, that
the font baseline may stay both for a single-line staff or for the
middle of a 5-lines staff). Of course, semiquaver rest should be set
half space higher if they appear high above staff or in a widely-spaced
two-lines staff (the same applies to all shorter rests of the value
being an even power of two, as well) then it would be _really_ centred
(but this is too rare to address it by glyph registration).

> Sibelius - http://i.imgbox.com/adt0q244.png
> Finale - http://i.imgbox.com/abdjc1cQ.png
>
> Finale does a better job here than Sibelius, in my opinion.

As to my eye, Finale is better on 5-line staff, and Sibelius is better
on 1-line staff (but not for rests shorter than hemidemisemiquaver).
But, generally, for 1-line staff, quaver and shorter rests are too high
in Finale and too low in Sibelius (however, crotchet in Sibelius is
perfect, to my eye).

> And in my
> opinion it makes sense for the rest glyphs to be registered in a fashion
> that makes Finale's default appearance easy for a scoring application,
> which I think means that rests should be positioned relative to the font
> baseline as if the font baseline is the middle staff line of a 5-line
> staff (or indeed the only staff line of a 1-line staff, which is nominally
> equivalent to the middle staff line of a 5-line staff anyway), which is
> how rests are currently registered in (my development version of) Bravura,
> like this:
>
> Bravura - http://i.imgbox.com/adrRgVav.png

OK, I like this one. It is similar to what I had in mind.
I just have a problem with the inconsistent registration of a semibreve
rest. And I suppose registering it so that it hangs from the baseline is
much more convenient for drawing cues.


Christof Schardt wrote:
> If there is a logial reference point (vertical) für a glyph,
> this also will be the natural fix point when scaling is applied.
> Choosing the baseline on this reference height makes the
> positioning robust against scaling.
Exactly.

--
Emil Wojtacki

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