One of the more common dilemmas for people is choosing the paper size for printing their photos. Everybody knows that if your digital camera does not produce enough pixels (or actually megapixels) printing its photos on a large paper size will yield poor quality and you will be able to see the actual pixels (also known as pixelation) So how many megepixels do I really need in order to print on a specific paper size? there is no one right answer for that. The actual quality of the print depends on many factors other than the number of pixels. For example the paper quality itself the printing process that is used the lighting conditions when the photo was taken the photo itself (i.e. portraits are different than scenery) and much more.
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However a rough estimation of how good a picture will be based on the number of pixels can be calculated and is actually pretty easy to do. When evaluating how good a print will be there is a measurement that is simple to use and provides a good estimation for the quality - it is called PPI (pixels per inch). PPI is actually the number of pixels along one inch. To get a good print you would need a certain PPI (on both X and Y axis).
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Experiments show that the following qualities are usually associated with a specific PPI number:
PPI 100 - fair to bad
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- PPI 200 - good
- PPI 300 - very good.