Optimize png, jpg images / Convert svgs to png #imagemagick #inkscape #png #optipng

image-conversion

//inkscape from the command line conversion
cd your-directory-with-the-svgs/
for i in *; do inkscape $i --export-png=`echo $i | sed -e 's/svg$/png/'`; done
//imagemagick
mogrify -format png *.svg
######png bash optimization one directory
#!/bin/bash
cd /path/to/png/storage/2010/01/c/
mkdir optimized
## store optimized images in optimized directory ##
## Keep file system permission and make a backup of original PNG (see options below)  ##
for i in *.png; do optipng -o5 -quiet -keep -preserve -dir optimized -log optipng.log "$i"; done
##########optipng all in one directory with find and xargs
cd /var/www/html/uploads/
find . -type f -iname "*.png" -print0 | xargs -I {} -0 optipng -o5 -quiet -keep -preserve -log optipng.log "{}"
### optimizing jpgs
find /the/image/path -name "*.jpg" -type f -exec jpegtran -copy none -optimize -outfile {} {} \;

optipng -o7 *.png for png compression / optimization

As I found that gist in Google, I presume someone else will also. Here is lossless optimisation for your png and jpeg images:

find . -type f -iname "*.png" -exec optipng -o7 -preserve {} \;
find . -type f -iname "*.png" -exec advpng -z4 {} \;
find . -type f -iname "*.png" -exec pngcrush -rem allb -brute -reduce -ow {} \;
find . -type f \( -iname "*.jpg" -o -iname "*.jpeg" \) -exec jpegoptim --strip-none {} \;