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The image resolution is specified from the total number of pixels, thus denoting the Dot density and is therefore a measure of the quality of an image.
Dpi and Ppi both define the resolution, but each refers to a different medium: print and digital.
Dpi - dots per inch
Dpi refers to print media and means: Dots per inch. With a higher dpi value, the quality of a print medium increases, the image becomes more detailed and sharper in print. At least 300 dpi is always used as standard.
Ppi - pixels per inch
Translated, this means pixels per inch. The ppi refers to digital media and describes the density of pixels within a digital image.
Aspect ratio
This describes the proportional relationship between the height and width of an image. Essentially, it describes the shape of an image. They are measured using the width to height formula.
For example, a square image has an aspect ratio of 1:1, as the height and width are equal. A portrait format example would be 2:3 - with this aspect ratio, the height is 1.5 times greater than the width.
In contrast to digital images, analog images are measured in centimeters. For this reason, it is important to know which digital size matches the desired analog size when printing an image.
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