Dithering is analogous to the halftone technique used in printing. Dithering is often used for displaying halftone images. Dot gain is caused by ink spreading around halftone dots. The resolution of a halftone screen is measured in lines per inch (lpi). The newspaper experimented with partial-color printing and the use of halftone for photographs and portraits. It discards the high-frequency information which blurs the image and simultaneously reduces the halftone pattern. Consequently, one halftone image has multiple plausible reconstructions. Halftone images can be compressed using two methods. This is similar to the blurring effect of our eyes when viewing a halftone image. The idea of halftone printing originates from William Fox Talbot. Later, it also started the work of halftone blockmaking and printing and tri-colour printing. William Fox Talbot is credited with the idea of halftone printing. The halftone quaver image on the cover was designed by artist Rob O'Connor. The idea is to use different strategies depending on the actual halftone image. This results in error diffusion having a higher apparent resolution than other halftone methods.