Screen angles

On 5/11/2008 5:09 PM David Nebenzahl spake thus:

> By the way, the standard screen angles for 4-color (CMYK) printing are:
> 
>    K (black): 45°
>    M (magenta): 75°
>    Y (yellow): 90°
>    C (cyan): 105°

Interesting explanation of screen angles can be found at 
http://www.dtp-aus.com/hlftone.htm
(scroll down to "Screen(#)  Ruling 
and Angles").

Interestingly, it's not just a matter of reducing moiré effects; the 
screen angles are selected to create "rose" patterns which, apparently, 
are the least bad alternative (there will always be some kind of pattern 
generated by multiple halftone screens, and this is thought to be the 
most pleasing one).


-- 
The best argument against democracy is a five-minute
conversation with the average voter.

- Attributed to Winston Churchill