Add metadata to images using XnView

XnView is an image viewer and organiser tool. The tool has a strong module to handle image metadata. No other tools offer user-friendly metadata management interface. XnView is very helpful for add metadata (keywords, byline, location etc.) to images. Metadata can give more visibility for images while search engines dig for information. XnView is very useful for photographers and website content developers and search engine optimizers.

Installation

Download the deb file from XnView homepage and install using dpkg command.

sudo dpkg -i XnViewMP-linux-x64.deb

After installation, XnView will appear in Applications > Graphics 

How to change Ubuntu 10.04 login screen image

Execute the following command in a terminal,

sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow

Copy an image to /usr/share/backgrounds

cp yourimage.jpg /usr/share/backgrounds

Logout Ubuntu.

You can see a window will pop up, select "Wallpaper" and locate the desired image. You can change the image from there.

Login to system and open a terminal and execute following command,

sudo unlink /usr/share/gdm/autostart/LoginWindow/gnome-appearance-properties.desktop