change compression algorithm of KDE4 ark dolphin context menu

in KDE4 with dolphin file manager, and ark compression manager program installed, you have a contextual menu that enables you to simply zip and unzip your files. Unfortunately its default compression file formats are a bit weired and you will pretty soon feel the need to tweak them. Here is how:

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Photoshop median filter in GIMP is called despeckle filter

Many times, after patching your pictures in GIMP you need to make some blur in order to let the picture appear “more natural” and less tainted. This is accomplished in Photoshop with the Median Filter. In GIMP there is no filter named ‘median’, however the same effect can be achieved by the despeckle filter : [...]

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Configure GRUB2 options and background

Starting from next Ubuntu version Karmic 9.10 new GRUB2 boot loader in installed by default. GRUB2 comes with a bunch of technical enhancements, most notably support for new filesystems, a modularized settings configuration, recovery support and indeed better background image support.

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