Re: Dpi and line screen
Re: Dpi and line screen
- Subject: Re: Dpi and line screen
- From: "jc castronovo" <email@hidden>
- Date: Sun, 1 Jan 2006 17:41:59 -0500
If what we're really talking about is grain vs. noise, not all digital
images have low noise and not all film has high grain, so the amount of
artificial sharpening one can apply will vary with the image and one's
ability in sharpening. It's hard to speak in generalities for that reason,
but I understand where you're coming from now. Also, I assume that you're
making a 4x5 or larger image from your 35mm scan since the LVT can't write
anywhere near that many pixels on a 35mm area.
It's interesting that screened output favors digitally captured images over
scanned film images. I'm not sure why this would be, but I'm not so sure
that grain is the culprit that requires greater oversampling from images
that originate on film either. Maybe there's more to see in film to begin
with *because* it has grain to look at. Hey, all this stuff is an illusion
anyway.
john
----- Original Message -----
From: "Mark Rice"
I think we are not on the same wavelength here. My point is this: when I
used to scan 35mm film for LVT output, I found that I had to scan it at
6000
x 9000 pixels, to maintain the grain image of the film. This left us with
"original sharpness of the film". I recorded this on the LVT at the same
resolution. I assumed when I first started using a digital camera that I
would need the same number of pixels. Turns out that is not true. By using
some sharpness enhancement (which can be pushed further than it can on
film, because there is no grain to over-enhance), I could achieve nearly
equivalent results with 2000x 3000 pixels.
Something similar is true with screened images. When scanning film, I
found the 300dpi >150 lpi line screen to be a valid rule. But with a
digital
camera image, I found that I could get very good results with 200 dpi >
150
lpi screen.
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