On Wed, 2006-06-14 at 12:08 +0100, Paul Smith wrote: > On 6/14/06, Ben Lancaster <lists@xxxxxxxxxxxxxxxxxx> wrote: > > >> some tool to automatically crop images. Any suggestions? > > > > > > Gimp scripting is what you're looking for. > > > > ...or ImageMagick and a bash script if you felt that way inclined. > > Thanks for all suggestions. pngcrush seems quite effective! > > Paul > This is an exellent script I found on the web, that really compresses png files: ########### #!/bin/bash # create backup copy cp $1 $1.orig #convert the image to indexed convert -quality 0 +dither -colors 256 $1.orig $1 # shrink the PNG using three tools pngrewrite $1 $1 optipng -zc1-9 -zm1-9 -zs0-2 -f0-5 $1 advpng -z4 $1 # display file sizes of the original and compressed image ls -sla $1* ########### It depends on three tools: pngrewrite, optipng and advpng. If the image is a photo it may be a good idea not to convert it to indexed, but then the gain will be smaller. and this will compress all the png images in the current directory: ########### #!/bin/bash # # This script converts all PNG files in the current directory to # 256-color indexed using maximum compression. # # Written by Frank Schoep # # get file list and loop through all files FILES=`ls -1S *.png` for FILE in $FILES do cp $FILE $FILE.orig convert -quality 0 +dither -colors 256 $FILE $FILE pngrewrite $FILE $FILE optipng -zc1-9 -zm1-9 -zs0-2 -f0-5 $FILE advpng -z4 $FILE done ########### Greetings, -- Peter Kostov Sofia, Bulgaria Photographer, web designer, 3D modeling, informational services Home site: http://www.light-bg.com
