On 22 Apr 2004 at 16:39, Ann Sanfedele wrote:
> Is this something that has always been a problem > with video technology or > is it (a) just since the digital revolution > and (b) only something to worry about in MOVING > images? To add to what John said it's been a problem in the printing industry since way back when, and strangely the solution only came with the digital age. The old copy cameras that were used in conjunction with physical screens to produce the plates for colour printing caused many a problem when trying to reproduce fine patterns such as clothing materials etc. The Moir� effect generated between the regular screens and material textures played havoc leading to output with strange areas of distorted colour and visible patterning. Then came digital scanning and the electronic imaging of films used to produce printing plates. They initially had the same problems with Moir� due to the use of regular masks however some clever programmers solved it by using a randomized stochastic screening mask technique. Virtually all personal ink-jet printers drivers use this stochastic principle, remember how bad the colour print were from the first dot matrix driven colour printers :-( Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
