SUSE & openSUSE

Pngcrush is an optimizer for PNG (Portable Network Graphics) files. pngcrush is an excellent batch-mode compression utility for PNG images. Depending on the application that created the original PNGs, it can improve the file size anywhere from a few percent to 40% or more (completely losslessly). The utility also allows specified PNG chunks (e.g. text comments) to be inserted or deleted, and it can fix incorrect gamma info written by Photoshop 5.0 as well as the erroneous iCCP chunk written by Photoshop 5.5. Its main purpose is to reduce the size of the PNG IDAT datastream by trying various compression levels an PNG filter methods. It also can be used to remove unwanted ancillary chunks, or to add certain chunks including gAMA, tRNS, iCCP, and textual chunks.

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If you have installed openSUSE with the default selections of choosing one of the available (say KDE4) then only the selected Desktop environment is installed. However, should you later choose to install and use another desktop Environment say (GNOME) then this can easily be installed and as always just a few clicks away.

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Hostname is the name of the pc or laptop or even your system with which it is identified on a network. When you did the installation, you would have not specified the hostname or is assigned by a DHCP server but you would want to change it then here is the procedure.

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