Re: Gold resolution
Re: Gold resolution
- Subject: Re: Gold resolution
- From: email@hidden (Bruce Fraser)
- Date: Mon, 11 Mar 2002 10:55:40 -0800
At 9:54 AM +0100 3/11/02, Johan Lammens wrote:
on 3/9/02 3:35 AM, Bruce Fraser at email@hidden wrote:
The only thing that's certain in all this is that anything over 2.5x
the linescreen will be discarded in the RIP.
The key word is linescreen (AM, "rosette", "cluster" halftone) here - things
are different with FM (stochastic, error diffusion, "scatter") halftones.
There is no hard and fast rule for image resolution when using FM
halftoning, but my personal rule of thumb is 200 pppi max (pixels per
printed inch, i.e. at final print size) for a good quality FM halftone on a
six-color CMYKcm inkjet printer at 600 ppi rendering (i.e. a 1:3 ratio).
Your mileage may vary. Note that this applies only to images (photos); for
vector content in general you should use the maximum resolution, i.e. The
rendering resolution of the rip (which is not necessarily the same as the
advertised print resolution).
Johan
I have to agree that there are no hard and fast rules for FM screening!
I've actually had some pretty good results at 1:1 on press. The
inkjets I've used all have asymmetric resolutions, generally higher
than 600 ppi, and I've had some images that, on glossy paper on the
Epson 720x2880 dye inks, actually benefitted from going as high as
480 ppi. On matte papers, I don't need as much, but 200 seems on the
low side. Then again, on a large number of images I suspect you
wouldn't see the difference. I've learned the hard way not to publish
magic numbers for FM resolution...
B
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