ImageMagick
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, but in case you have to, then ImageMagick will make this job really easy for you. ImageMagick is a great opensource command line utility for image manipulation.
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Change the screen resolution thru commandline, using xrandr
Once I changed my screen's resolution to a very small value and as a result I wasn't able to see the drop down box of the GUI application to change it back. This was when I came to know about Xrandr, a great command line application to configure X11 server. Well, there are a lot of things it can do but if you ever want to change the resolution, use this command.
By shredder12
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