Re: Dpi and line screen
Re: Dpi and line screen
- Subject: Re: Dpi and line screen
- From: "jc castronovo" <email@hidden>
- Date: Mon, 2 Jan 2006 08:43:12 -0500
----- Original Message -----
From: "Ernst Dinkla
The usual ratios mentioned for acceptable work fall between 1.40 and 2 x.
I have always assumed that the lowest acceptable quality was at the root
value 1.41...x, in conventional screening corresponding with the 45 degree
angle of one of the screens the digital image at 0/90 degree has to be
converted to (the other angles but the 0 degrees need a similar factor).
The 2x being the maximum needed in view of Nyquist. With stochastic
screening etc and better upsampling + print sharpening possible on digital
images these days the lowest ratio may have dropped to 1:1 for the digital
images to start from. Most of time this ratio number isn't an issue at all
with today's quality of digital images and cheap memory. Is the extra
time and space needed for 2x a real problem ?
It's not the time or cost, but sometimes it just isn't available from the
source image. What is the wisdom of scaling up a low resolution image only
to scale it back down again?
john
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