I want to print a single image that will ultimately be almost 2 metres high, and it's perfectly all right for me to do so by printing several A3 sheets of paper and gluing them onto a big piece of cardboard. How should I go about this? (I'm on Windows XP.)
Poster Printer works with your existing printer to allow you to print documents at a much larger size than would fit on a single printed page
(open source, Windows)
PosteRazor cuts a raster image into pieces which can afterwards be printed out and assembled to a poster. PosteRazor is open source and is available for Windows, Mac OS X, and Linux.
Use rasterbator http://homokaasu.org/rasterbator/
LibreOffice Calc. Drag and drop your image to the Calc. Adjust page and print settings (in print preview), remove unnecessary headers, footers and etc. Print.
I also tried to do the same with Excel, but it ignores the drag and drop of an image and ignores image DPI when inserting the image from file.