How To Do a Poster Yourself
Photo Enlargement. The above discussion about photo quality is important because your image must be enlarged to create your poster. Starting with the highest dpi image you can, be aware there are several ways to enlarge digital pictures. Some methods use special software specifically designed for photo enlargement. There are methods that use photo editing software like Photoshop® to enlarge images but doing so will greatly degrade or decrease the visual appeal of the image.
Click here to read about Photoshop® Photo Enlargement
The reason is because photo enlargement requires what's called “interpolation” - complex processing that can be thought of as using the individual dots or “pixels” that make photos create more “similar” pixels so the image can be increased in size. 
Images are made up of Pixels
In the image above, the right image (downsized for this example) is full sized at 8"X10". The paper image from the photographer was scanned to show that every image - whether printed or in digital form - is made up of these dots or “pixels.” The technology used to enlarge these pixels to make your photo suitable for poster printing is critical to the quality of the finished poster presentation.
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