Resolution refers to the
number of pixels in an image.
Resolution is
identified by the width and height of the image as well as the total number of
pixels in the image.
PPI: Pixels per inch.
Most
commonly used to describe the pixel density of a screen (computer monitor,
smart phone, etc…) but can also refer to the pixel density of a digital image.
DPI: Dot’s per inch.
The
number of dots in a printed inch.
The more dot’s the higher
the quality of the print (more sharpness and detail).
The basic equation for
calculating PPI is:
PPI = height(pixels)/
height of image (inches).
So, for example, if you
want to print a 4-inch-by-6-inch image, and your pixel count is 800 x 1200, you
need to divide 800 (the pixel height) by 4 (the photo height) and then divide
1200 (the pixel width) by 6 (the photo width).
The PPI will be 200,
providing you with good quality photos.
However, if you want to
print a larger photo, for example 8-inch-by-10-inch photo, the PPI reduces to
100 for width and 120 for height, giving you lower quality prints
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