DPI
Dots Per Inch, is a measure of spatial printing or video or image scanner dot density,
in particular the number of individual dots that can be placed in a line within the
span of 1 inch (2.54cm).
How to check DPI of an image:
1. Right-click on the image file, and select Property.
2. Switch to tab Details. You can get detailed information about the image.
Greyscale
In photograph, computing, and colorimetry, a greyscale or greyscale image is one in
which the value of each pixel is a single sample representing only an amount of light,
that is, it carries only intensity information. Images of this sort, also known as black-
and-white or monochrome, are composed exclusively of shades of gray, varying
from black at the weakest intensity (0) to white at the strongest (255).
Best practices for setting greyscale:
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