When you want to make a long banner or create a large sized poster of an image using a standard home printer, you are limited to 8.5-by-11-inch pieces of paper (sometimes 8.5-by-14). So the solution is to print a portion of the picture on separate pieces of paper and then piece them together like a puzzle. It is not the most professional result and there may be flaws, but it is a cheap and rather simple way of making a larger-scale printed image.
Insert or open the picture in Adobe Photoshop or a similar graphic design program. Photoshop is ideal because it allows you to cut and paste portions of the image into separate files. Whenever possible use an image that is 300 dpi (dots per inch) or higher in resolution—a low-resolution image will be blurry and pixelated when printed.
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Decide on the size that you want the image to print. For this example, let's make a poster sized at 17-by-22 inches (four 8.5-by-11 pages). Keep in mind that the final trim size after you cut off any white edges will make the printed picture slightly smaller than 17-by-22.
Divide the image into four equal parts so that you will be printing it on four pieces of standard-sized, 8.5-by-11-inch paper. Select, copy and paste each segment into a separate file in Photoshop.
Print each file from Photoshop (or your image editing program). Choose the option "fit to page" and center the image so that you will be getting the maximum size of each picture segment on the page. Choose a glossy stock paper if possible for a more professional-looking print.
Use an X-Acto knife (a special knife used for precision when cutting papers) and a ruler to cut the white edges around the image off of each printed page. Be careful to cut right on the line so that all of the parts of the picture will line up correctly.
Line up the pages to form the whole picture so that you can see how it will be taped together. Place the tape along the edges that will be joined and then secure the pages together.