Re: Dot shape prevalence
Re: Dot shape prevalence
- Subject: Re: Dot shape prevalence
- From: Roger Breton <email@hidden>
- Date: Mon, 10 Oct 2005 11:01:36 -0400
> Roger, you're gonna' have to get a more powerful glass/scope to review
> this kind of thing.
Rich, this is also visible with a 75x loupe, even worse so.
> What you're seeing could be the result of many
> things I'm leaning toward plate grain.
Plate grain? I'm going to have to get hold of a set of analog plates to
really compare.
> I don't know the precise
> measurements for 150 lpi, but I was just reviewing a 10% patch at 170
> lpi. It's about 40µ this is much larger than the minimum spot size
> for a 2400 dpi device.
Right, it is pretty small.
> The dot you're looking at is comprised of
> several spots
OK.
> (the laser spot size is constant)
I agree the laser spot is of a constant size.
> so, yes, there will be
> some stair-stepping to the edges but we're talking TINY.
Tiny, as in not visible with a 10x loupe?
> Tiny to the
> point that you shouldn't be able to see it with a 10X loupe. I've got a
> 75X and a 2400 dpi plate setter and those dots are CLEAN.
Well, we're going to have to exchange notes...errr, plates! I'll cut an 8x10
equivalent out of our plates to send you and you tell me what it looks like
when you do get it, fair ehough? Anyone else wants to participate in this
informal CTP dot shape survey?
> The clean character of CtP dots is, from what I've read/heard/been
> told, the primary reason for the lower dot gains associated with CtP.
Right. Lower gains and supposedly sharper dot image because of less
diffusion around the shape of the dot because this is a direct imaging
process and not a contact between a black image on a polyester base and
scattering coming from a lamp above it that creates a halo around the dot.
> I really suspect you're seeing some characteristic of the plate or
> chemistry.
I wish. What CtP system are you using?
> Rich Apollo
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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