Re: Noteheads slightly too large

[tisimst]

Gilberto, et al,

On Tue, Feb 9, 2016 at 7:14 AM, Gilberto Agostinho [via Lilypond] <
address@hidden> wrote:

> Hi Urs,
>
> Urs Liska wrote
> Are you completely sure that the issue is in LilyPond's output and not in
> the displaying program?
>
> Well, I don't know how can I be *completely* sure about it, but I see this
> issue on Evince and Okular pdf readers, as well as in Frescobaldi. If you
> have some suggestion on how to test this further, please let me know.


WARNING!! TECHNICAL ANALYSIS AHEAD!! ;-)

Although microscopic, I can confirm this is true at the font level (at
least at the default printed 20pt size, I didn't check the other optical
variants). Relative to a 1000-em unit staff height (which is what the fonts
are designed to, center of bottom staff line to center of top staff line),
here are the dimensions causing the problem you are seeing:

staff-space = 250-em
staff line thickness = 25-em (i.e., 0.1 staff-space)
solid notehead height = 276-em

Now, here's the discrepancy. The distance between the bottom of a staff
line to the top of the next staff line up, is 250+25 = 275-em. That means
that there is an overall difference in size of 1-em unit (at the 20pt
printed size, this equates to 1/50pt = 0.00028in = 0.0071mm difference). In
other words, we are technically splitting hairs with this, but nonetheless,
it is a difference. The solid notehead is "too large" by 1/100pt on either
side.

I'm not sure if this warrants a design change or not, but there, at least,
is the evidence. It's not just the PDF reader. I've looked it over with
many different readers in both PDF and SVG backends and it always shows up.
Well, there's why.

HTH,
Abraham




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