KDE 4.5.2 changing Wallpaper / background

This is for Arch Linux but should be usable on other distributions as well..

Changing wallpaper on the latest KDE is just a right lick and choosing "Desktop Settings"... but what if you had conky running and you wanted to change the wallpaper / background using command line - like from a batch file - that is a problem.

Shall detail running conky in another post ...

Things to have installed - KDE 4.5.2, eterm

Here we create a folder "walls" in home folder and another called "gamma" in walls - as I have all my wallpapers in walls folder - you can modify as you please. The gamma folder holds the copy of the same wallpaper as the one used except we use convert [from imagemagick] to darken the image.

#!/bin/bash

fileext=`echo "$1"|awk -F . '{print $NF}'`;

filename=$(basename "$1" "$fileext");

out_file="$filename"gamma."$fileext";

rm ~/walls/gamma/*;

cd ~/walls/gamma;

convert "$1" -gamma 0.7,0.7,0.7 "$out_file";

kwriteconfig --file plasma-desktop-appletsrc --group Containments --group 1 --group Wallpaper --group image --key wallpaper "$1";

kquitapp plasma-desktop;

sleep 1;

plasma-desktop ;

~/bin/fbsetbg "$out_file";

The listed file is linked below and fbsetbg is a script file from fluxbox to set your wallpaper. 

conwall.sh

fbsetbg