Re: png cropping

[Jonathan Kulp]

Sorry, one more adjustment to the script.  I found out that there's no 
ppmtotiff command, so I had to add another conditional to accommodate 
that.  Seems to work with all combinations now:

#!/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
    echo -n "Enter desired output format (png or gif): "
    read TRANSFORMAT
    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
    ppmto$TRANSFORMAT -transparent '#ffffff' $STEM-cropped.pnm > 
$STEM.$TRANSFORMAT
    eog $STEM.$TRANSFORMAT &

  else

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

    cd $OUTDIR
    lilypond --format=png -dresolution=$RES $srcfile
    pngtopnm $STEM.png > $STEM.pnm
    pnmcrop -white $STEM.pnm > $STEM-cropped.pnm
      if [ "$FORMAT" == "tiff" ]
        then
          pnmto$FORMAT $STEM-cropped.pnm > $STEM.$FORMAT
        else
          ppmto$FORMAT $STEM-cropped.pnm > $STEM.$FORMAT
      fi
    # 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:
> Jonathan Kulp wrote:
> > look into it.  It would be simple enough to add a prompt asking if 
> > you'd like a transparent background, I guess.
> Now that you mention it that rings a bell with me too!   I'll have to 
> search---
>
> giftoppm foobar.gif | ppmtogif -transparent '#rgb' > fooquux.gif
>
>
> works if you want gif.  First translate to ppm, then translate back to 
> gif  with the -transparent flag specifying which color, (in this case 
> #fff) will be transparent.
>
> 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

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