Prints should always be protected behind glass. The glass protects the image from environmental pollutants, sticky fingers and fading from exposure to sunlight. If possible avoid hanging in direct sunlight.
A mount board will not only make your picture stand out more it holds the print away from the glass slightly. Prints mounted directly under the glass tend to stick to the glass and also suffer from optical distortions.
Frames need to be 4" to 6" bigger then the image to allow for a reasonable amount of mount to show. A picture in a too small frame will never look its best. Conversely, bigger then you thought you needed is rarley a problem.
If you mount your own print only attach to the top of the mount board. This allows the print to' hang' naturally and prevents rippling.
Ikea do a good selection of inexpensive frames.
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