A circle without and with antialiasing respectively.
The act of smoothing curves or lines on the computer screen to avoid blocky edges. There are mainly two reasons why anything drawn on screen looks blocky without antialiasing: 1. Computer screens have very low resolution, which generally vary between 72 and 120 DPI. This is far below the minimum resolution needed to get acceptable results, which is 300 DPI. 2. When a computer program draws a curve or line, it only changes the color of pixels sitting on the shortest path between the start and end points, and it does not produce a smooth tonal range.
Antialiasing changes the color of pixels surrounding a newly drawn curve or line to intermediate values ranging from the color of touching areas of the background to the color of that particular curve or line.
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