Hello list,
If anyone out there wants to put drop-shadows onto pictures in a batch way
(under Gnu/Linux) then I have started a wee scripty thing. It's pasted in
here cos I dunno about attachments to the list. I hope it's not mangled on
the other end ...
Hope it helps someone, I searched the nut for ages and found nothing like
it. It uses a convert command directly out of the online help, but adds
convenience to the whole affair.
I'm not really happy with the quality of the corners of the shadows, but I'm
not enough of a IM guru (actually not one at all) to fix that.
HTH
Donn.
----------------------------------
#!/bin/bash
#
# shade
#
# Copyright (c) 2007 Donn.C.Ingle <[EMAIL PROTECTED]>
# Released under the GPL. The moral right of the authors to claim
authorship
# of this shadowy work has been asserted.
#
# PURPOSE:
# Put shadows under stuff
#
# USAGE:
# shade -h
#
# BUGS:
# Don't throw weird filenames at it.
# Won't shadow other than southeast
#Some defaults
col=black
darkness=60
fuzzy=2
xoff=4
yoff=4
wantsnq=0 #assume user does not want to crush pngs.
hasnq=1 #assumes pngnq is installed.
#Function that does the heavy-lifting
shadow () {
#darknessxfuzzyness+xoff+yoff:
#offsets can be negative, i.e. to left or upwards
#but we are not handling them in this script.
#so southeast only - i.e. +x+y
filter=$darkness\x$fuzzy\+$xoff\+$yoff
#Experimental code for other directions
#xoff=$(( $xoff + 2 * $fuzzy))
#yoff=$(( $yoff + 2 * $fuzzy))
#splice=$xoff\x$yoff
#Original version:
#/opt/bin/convert "$1" -background none -gravity southeast -splice
$splice
\( +clone -background Black -shadow $thing \) -background none -compose
DstOver -flatten temp.png
#This one make the canvas too big all round.
#/opt/bin/convert "$1" \( +clone -background black -shadow $thing \)
+swap -repage +$xoff+$yoff\! -background none -mosaic temp.png
#Nice one.
convert "$1" \( +clone -background $col -shadow $filter \)
+swap -background none -mosaic temp.png
#PNGs can be HUGE. I cannot figure out how to reduce them in
imagemagick,
so I rely on pngnq which rocks.
[[ $wantsnq = 1 && $hasnq = 1 ]] && (pngnq -f temp.png 2>/dev/null; mv
temp-nq8.png temp.png) #compress the heck out of it
#Now, let's make sure we copy OVER older shadow files
#If the current name is "shadow.xxxxx" then strip that.
nam=`echo "$1" | sed 's/shadow\.//'`
#Strip the original file extension
notype=${nam%.*}
#Build the new name
newname=shadow.${notype}.png
#Now rename it, erasing any older shadow file.
mv temp.png $newname
}
#Function that displays the help.
help () {
echo "The shadowy shadow script"
echo
echo "-h : This message"
echo "-d n : Darkness of shadow (=$darkness)"
echo "-f n : Fuzzyness (=$fuzzy)"
echo "-x n : Offset x (=$xoff)"
echo "-y n : Offset y (=$yoff)"
echo "-c col : Colour of shadow, name or rgb code. Put it in quotes.
(\"$col\")"
echo "-l : Lists all the colours and quits"
echo "-crush : Will use pngnq to crush the life out of the png. It gets
converted to an 8-bit file, but the size is really worth it."
echo
echo "All files will be output with \"shadow.\" in front and as png."
echo "Examples:"
echo "$0 -d 50 -f 3 -x 2 -y 2 file1.jpg file2.gif file3.png"
echo "$0 -d 20 *"
echo "$0 -crush -c purple *.jpg"
echo
echo "You can also repeat arguments:"
echo "$0 -c wheat pic1.jpg -crush -c purple pic2.jpg"
}
#Look for convert command
if [[ ! -e `which convert` ]]; then
echo "You need Imagemagick installed."
echo "Ubuntu : sudo apt-get install imagemagick"
echo "Then try again."
exit 0
fi
#No params == help
[ $# = 0 ] && help && exit 0
#Look for the pngnq app. Set a var.
if [[ ! -e `which pngnq` ]]; then
echo "Tip: Install pngnq for totally awesome png compression. (Ubuntu :
sudo apt-get install pngnq.)"
hasnq=0
fi
#Keep going while there are still parameters:
until [ -z "$1" ]
do
#Was it help?
[[ "$1" = "-h" ]] && help && exit 0
#Was it list colour?
[[ "$1" = "-l" ]] && convert -list color | cut -d " " -f 1 |
sed 's/-*//' | column && exit 0
#Was it crush?
if [[ "$1" = "-crush" ]]; then
wantsnq=1; shift
[[ $hasnq = 0 ]] && echo "Cannot crush, you haven't got pngnq
installed."
fi
#Was it colour?
if [[ "$1" = "-c" ]]; then
col="$2"
shift; shift
fi
#Was it Darkness?
if [[ "$1" = "-d" ]]; then
darkness="$2"
shift; shift
fi
#Was it fuzzy?
if [[ "$1" = "-f" ]]; then
fuzzy="$2"
shift; shift
fi
#Was it x?
if [[ "$1" = "-x" ]]; then
xoff="$2"
shift; shift
fi
#Was it y?
if [[ "$1" = "-y" ]]; then
yoff="$2"
shift; shift
fi
#Was it a file?
if [[ -e "$1" ]]; then
#yes, it's a file, but is it an image?
file "$1" | grep image 1>/dev/null
[[ $? = 0 ]] && shadow "$1" #yes, so shadow it.
fi
shift #remove that filename
done
exit 0
-----------------------------------
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