Both printed and digital images are made up of thousands of coloured dots, the count of how many dots in an image is known as the resolution. Generally, what defines the quality of an image is the resolution, the higher the resolution of a picture, the clearer and smoother the image will look.
Digital dots are called pixels. Cameras measure their resolution in Mega Pixels or MP for short, this is a count of the total pixels used to make up the picture.
The higher the megapixel count the more detailed the image, however there is far more to a good photo than a high megapixel count. The camera lens has a large impact on quality of image, typically camera phones have a low quality lens which can cause photos to look grainy.
Resolution of printing is measured in DPI (Dots Per Inch), most printers will print at or above 300dpi, so in a square inch you will find 90,000 dots. If printing at 300dpi you will be printing around 7.9MP on an A4.
Screen to Print Issues
Most screen resolutions work at 72 pixels per inch, whereas commercial print uses 300dpi or more. An image that appears to be high quality might appear less crisp and clear when printed at the same size.
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