Re: png export resolution

[Federico Bruni]

On Tue, 14 Apr, 2020 at 08:35, Martin Tarenskeen 
<m.tarenskeen@kpnmail.nl> wrote:
> Hi,
>
> If I type "lilypond -dhelp" I see "resolution (101)". Do I understand 
> correctly that when using the --png option the default export 
> resolution is 101 dpi? I am sure there is a good reason to have 
> chosen 101 and not 100, or 110?
>
> Don't worry, I know I can change this with the -dresolution option. I 
> was just wondering about that strange value.

Hi Martin

I'm cleaning my inbox and I think nobody replied to your question.

It's not only in -dhelp, this is documented also in the Usage manual.

I've tried looking at git history.
That number changed from 116 to 90 and then 101.

There was a comment explaining that number:

;; at 101.178, a staff space is exactly 7 pixels.
          (resolution 101.178 "resolution for generating bitmaps")

So the purpose would seem to have a "pixel perfect" staff space.