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In halftone images, this additionally requires preservation of the regular pattern. The same applies to more complex tools like retouching. Many other image processing techniques are designed to operate on continuous-tone images. For example, image compression algorithms are more efficient for those images. [17]
A duotone image, made using black and blue in Photoshop. Duotone (sometimes also known as Duplex) is a halftone reproduction of an image using the superimposition of one contrasting color halftone over another color halftone. [1] This is most often used to bring out middle tones and highlights of an image.
The same algorithms may be applied to each of the red, green, and blue (or cyan, magenta, yellow, black) channels of a color image to achieve a color effect on printers such as color laser printers that can only print single color values.
Shades of gray produced by FM screening. Magnified version of the same image. Stochastic screening or FM screening is a halftone process based on pseudo-random distribution of halftone dots, using frequency modulation (FM) to change the density of dots according to the gray level desired.
Screening: In order to print, the continuous-tone image is converted into a halftone (pattern of dots). Two screening methods or types are amplitude modulation (AM) screening and stochastic or frequency modulation (FM) screening. In AM screening, dot size varies depending on object density—tonal values; dots are placed in a fixed grid.
A continuous-tone image is one in which each color at any point in the image can transition smoothly between shades, rather than being represented by discrete elements such as halftones or pixels. [1] Many printing methods use discrete halftone dots of cyan, magenta, yellow, and black .
Moiré patterns are often an artifact of images produced by various digital imaging and computer graphics techniques, for example when scanning a halftone picture or ray tracing a checkered plane (the latter being a special case of aliasing, due to undersampling a fine regular pattern). [3]
The resolution of that posterized image was limited only the the limits of the photographic emulsion on the halftone paper which is at least 2,000 dpi. If there was an image with a sharp line, that line will clearly be seen in the center of the dots at full 2,000 dpi resolution.