minimum size for slur targets

Ask or answer questions related to the flexo prepress environment.

Moderator: Frank Burgos

minimum size for slur targets

Postby ArtSteve » Wed May 19, 2010 9:05 am

Just bought the latest FTA F.I.R.S.T. book, and this info doesn't appear to be in it. What is the minimum size for slur targets? We run narrow web and are trying to keep the color bars and test items along the edges of our substrate smaller to save on material, but still keep the pressmen happy with enough area to do an acceptable reading. Thanks!
ArtSteve
 
Posts: 5
Joined: Sat Sep 22, 2007 11:21 am

Re: minimum size for slur targets

Postby ljgoldberg » Sat May 22, 2010 1:39 pm

Slur targets are a good indicator of mechanical problems on press, typically causing excessive dot gain. They do not give any indication of solid density. Solid density measurements are important, but don't give any information about tone reproduction or dot gain. A standard aperture on most densitometers is 3.5mm, you don't want to torture the pressman by giving him a target so small he needs to have the skills of Buffalo Bill to hit it.

Therefore, if you make the densitometer targets about 6.5mm (one quarter inch), you can have suitable targets for gray balance, dot gain, and density. If you rearrange the elements in a slur target you can still get a visually functional one that is 1/4 inch high, and have something that fits in the space allocated to the densitometer targets.

Regards,

Larry Goldberg
ljgoldberg
 
Posts: 31
Joined: Fri Sep 21, 2007 2:56 pm
Location: Carlstadt, NJ


Return to Prepress

Who is online

Users browsing this forum: No registered users and 1 guest