Re: Low screening measurement instrument
Re: Low screening measurement instrument
- Subject: Re: Low screening measurement instrument
- From: Henrik Holmegaard <email@hidden>
- Date: Wed, 4 Apr 2001 08:45:18 +0200
Saul Arana wrote:
Its for sure, that some one of you can help me, I need to know how to
profile printing system with a very low screening, about 30dpi or less. (its
a big, big, big format ink jet printing system)
There are manual spectros with large apertures for that. X-Rite has
the three aperture 528 and 530 (there are also pol and uv filters for
coarse and fluorescent surfaces). GretagMacbeth has a Spectrolino
with a large aperture, too.
The fewer dots you have, the bigger aperture do you need to integrate them.
The manual spectros have a drawback in that you have to concentrate
so as not to get the patches wrong, but they are on the other hand
versatile for other kinds of work.
There are large aperture automatic instruments, too. For instance,
the X-Rite Spectrofiler which comes with a choice of one of three
prefitted apertures sizes (you can't change them yourself). The
largest aperture size is 6 mm.
The normal aperture size instruments can be used also. In
ProfileMaker you can set the number of times the SpectroScan will do
a step and repeat measurement on the same patch in order to integrate
more dots. I don't see why you couldn't alter the patch height of the
DTP41 testchart in Photoshop, if you kept the distances the same for
the white and black contrast bars, but I haven't tried this.