Digital BW, The Print

Thank you Rodolpho, I am aware of how the rosettes form from offset press
printing, my question was how can you print in this fashion *without*
getting the rosette pattern as Austin said. (by using an ordered dither)

Your description of Moire is most accurate except that there is a further
discription in offset printing... this undesirable effect occurs when the
screens are improperly aligned. I'm not sure why we started calling the
rosette a moire pattern... Austin?

Carolyn

> The rosette you refer to is the very principle of off-set printing, and it
> will be present in every piece of paper which was printed with a halftoned
> image (as long as printed on an ordered dither). It shows up from the
> different angles the CMYK colors are printed.
> Moire is what happens when, say, the pattern of a digital back (mainly
> one-shot) "coincides" with the pattern of fabric, or any repeated tiny lines
> or dots - like a fence, for instance. It can be avoided if you increase or
> decrease - up to a certain extent - the resolution of the scan or the
> distance from the subject. Usually is impossible to eliminate luminance
> moire, but you can handle very well the moire colors.
> Hope this helps,