Re: png cropping

[Jonathan Kulp]

Ok I rewrote it a bit to allow for transparent background and I think it 
works nicely.  I changed it to ask whether the user wants a transparent 
background right after entering the output resolution.  If transparent = 
yes, then it does not prompt for an output format but instead uses png 
by default.  (It would be easy enough to add a prompt inside the if -- 
fi construct asking whether the transparent format should be png or gif, 
I guess.)  If transparent = no, then it asks what the final image format 
should be and then continues normally and outputs jpeg, tiff, or png.

Here's the revised script:

#!/bin/bash

#*****************************************************#
# Script for making image files from lilypond source  #
# suitable for use as musical examples to insert in a #
# document or web page.                               #
#*****************************************************#

# get filename from first argument
srcfile="`basename $1`"       

# get filename without .ly extension
STEM="`basename $1 .ly`"

# determine output directory
OUTDIR="`dirname $1`"

# ask for output resolution
echo -n "Enter output resolution in DPI (72, 100, 300, 600, etc.): "
# gather resolution input
read RES

echo -n "Would you like a transparent background? (yes or no): "
read TRANSPARENCY

if [ "$TRANSPARENCY" == "yes" ]
  then
    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
    pnmtopng -transparent '#ffffff' $STEM-cropped.pnm > $STEM.png
    eog $STEM.png

  else

    # ask for desired final output format
    echo -n "Enter desired output format (jpeg, png, tiff): "
    # gather format input
    read FORMAT

    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
    pnmto$FORMAT $STEM-cropped.pnm > $STEM.$FORMAT
    # open final image as background process in "Eye of Gnome" Image Viewer
    eog $STEM.$FORMAT &
fi


# removes pnm and ps files
rm *.pnm $STEM.ps




Patrick Horgan wrote:
> pnmtopng has the transparent argument, but pnmtotiff and jpeg don't 
> since they don't support transparency...so, using your script, if you 
> want transparency, you have to choose png for the output, then on the 
> translation step from ppm just add the appropriate flags.  I just tried 
> it adding a quick -transparent '#ffffff' to the command line and then 
> selecting png so it would work.  It worked like a charm:)
>
> Patrick
>
> > Re: the footers: are you talking about the "engraving by Lilypond" 
> > footer or some other thing?  
> Yep. Or the copyright statement, or the typesetter statement, et.al.
>
> Patrick

--
Jonathan Kulp
http://www.jonathankulp.com