Re: transparency and resolution don't go together

[Phil Holmes]

"David Kastrup" <address@hidden> wrote in message 
news:address@hidden
> "Phil Holmes" <address@hidden> writes:
>
> > Looks like a bug to me: it doesn't work on windows even if you ignore
> > the command line and set the options in the lilypond file:
> >
> > #(ly:set-option 'resolution 169)
> > #(ly:set-option 'pixmap-format "pngalpha")
> >
> > resolution is set, tranparent not.  Comment out the resolution line
> > and all is OK.
>
> Is there a way to see what options Ghostscript is getting called with
> from LilyPond?
>
> Under Linux, it would be easy enough to point PATH at directory
> including a "gs" script that not just calls gs but also records the
> command line arguments.
>
> Windows?

Just knocked up a c# app.  Results all look like they should.  Further 
testing shows that the two options together work for resolutions up to 160 
dpi, but fail above that...

Default call:
-q
-dDEVICEWIDTHPOINTS#595.28
-dDEVICEHEIGHTPOINTS#841.89
-dGraphicsAlphaBits#4
-dTextAlphaBits#4
-dNOPAUSE
-sDEVICE#png16m
-sOutputFile#./MidiTempo.png
-r101
MidiTempo.ps
-c
quit

With resolution set:
-q
-dDEVICEWIDTHPOINTS#595.28
-dDEVICEHEIGHTPOINTS#841.89
-dGraphicsAlphaBits#4
-dTextAlphaBits#4
-dNOPAUSE
-sDEVICE#png16m
-sOutputFile#./MidiTempo.png
-r169
MidiTempo.ps
-c
quit

Transparency set:
-q
-dDEVICEWIDTHPOINTS#595.28
-dDEVICEHEIGHTPOINTS#841.89
-dGraphicsAlphaBits#4
-dTextAlphaBits#4
-dNOPAUSE
-sDEVICE#pngalpha
-sOutputFile#./MidiTempo.png
-r101
MidiTempo.ps
-c
quit

Both:
-q
-dDEVICEWIDTHPOINTS#595.28
-dDEVICEHEIGHTPOINTS#841.89
-dGraphicsAlphaBits#4
-dTextAlphaBits#4
-dNOPAUSE
-sDEVICE#pngalpha
-sOutputFile#./MidiTempo.png
-r169
MidiTempo.ps
-c
quit

--
Phil Holmes
Bug Squad