1. Halftone
Halftone is a graphic design technique used to reproduce
an image by using dots of varying length with one or more
colors. It enables image display similar to a continuous
tone-like image but on a pixelated or halftone background.
Halftone is a type of static visual effect applied on digital
and print images. It works on a very simple principle, where
each pixel in an image area is considered a dot with
different sizes, some of which take up more space than one
pixel. When a picture/image is converted to halftone, the
image texture appears as if it has been pasted on top of a
collection of infinite but non-continuous dots. The dots are
actually not unlimited but equivalent to the image's total
resolution. The resulting image/picture is known as a
halftone image.
2.
3. Half tonning Technique:
• Newspaper, photographs simulate a grey-scale image that can printed using only black ink.
• A newspaper picture is, in fact, made up of a pattern of tiny black dots of varying size.
• The human visual system has a tendency to average brightness over small areas, so the black
dots and their white background merge and are perceived as an intermediate shade of grey.
• The process of generating a binary pattern of black and white dots from an image is termed
half toning.
• In traditional newspaper and magazine production, this process is carried out
photographically by projection of a transparency through a 'halftone screen' onto film.
• The screen is a glass plate with a grid etched into it.
• Different screens can be used to control the size and shape of the dots in the half toned
image.
• In computer graphics, half toning reproductions are approximated using rectangular pixel
region say 2 x 2 pixels or 3 x 3 pixels.
• These regions are called as “Halftone Patters” or “Pixel Patterns”.
