reduce size of images in folder

first install  http://www.imagemagick.org/script/binary-releases.php#macosx

then

for files in *; do convert -strip -quality 80 “$files” “$files”; done

in windows do a bat file an put this into it:

@ECHO OFF
ECHO.
ECHO This is a batch file
ECHO.
FOR %%c in (C:\Users\nilsen\Pictures\*.*) DO convert -strip -quality 80 %%c %%c

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