Re: Optimising output for screen.

[Phil Burfitt]

Trevor, I've downloaded a number of PDF viewers for Windows and taken screen 
snapshots at 96dpi on Vista of each at 100% scaling (PNG attachment). 
Problems occur in all of them as to be expected as Lilyponds output is 
optimised for printer and will have a resolution of probably at least 
300dpi. The most common problem seen in these viewers is the rendering of 
staves that when scaled down do not fall exactly on a pixel. Adobe doesn't 
seem to anti-alias raster images, but it's font rendering is a lot sharper. 
Evince does the best overall job IMO.

Phil.

> Trevor Daniels wrote Thursday, September 23, 2010 11:50 PM
>
> Nick Payne wrote Thursday, September 23, 2010 10:42 PM
>
> > Screen dump of some 2.13.34 output. PDF open at 200% in Adobe Reader
> > 9.3.4 on Ubuntu 10.04. Check the barlines spanning the staffgroups. Four
> > of the five barline terminations go past the top or bottom line of the
> > stave. Also look at the stems of the two sixteenth notes at bottom
> > right, which are markedly different in thickness.
>
> Nick, you'll get this effect as soon as any scaling is involved. The stems
> can be displayed only in integral numbers of pixels.  At normal
> magnifications this is either 1 or 2, depending on where the scaled
> line falls relative to the pixel grid. To avoid this type of distortion 
> you
> need to view at 100% with resolution set to the screen resolution
> (usually 96 pixels/inch), or 200% with resolution set to 192 pixels/inch,
> etc.
>
> Trevor

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