Make a Wall Poster Using Rasterbator

Do you want an image of your best friend's face on your wall? You can pick any picture you have and instantly make a wall poster.

Steps

Get Rasterbator. Keep in mind that the online version puts some restrictions on output size and resolution.
Run Rasterbator and select the source image.
Select the paper size and alignment. The Rasterbated image will be automatically split onto several pages, so you need specify the format of each unit paper (e.g. A4, A3, etc.) and its alignment, whether horizontal or vertical. If you plan to print poster yourself then make sure to select paper format supported by your printer(e.g. A4)
Define the output size. Output size is defined by the amount of papers to be used for image width or height. For instance, you can tell Rasterbator to produce a poster with a width equivalent to 12 horizontally-aligned A4 papers (see poster below).
Set the Rasterbation options. Specify color and resolution settings
Select output directory and press Press "Rasterbate".
Hang your creation on the wall.

Be mindful of copyrighted images, should you decide to print out multiple poster copies.