Re: RIP's for Photographers
Re: RIP's for Photographers
- Subject: Re: RIP's for Photographers
- From: "Ernst Dinkla" <email@hidden>
- Date: Thu, 16 Oct 2003 11:54:39 +0200
----- Original Message -----
From: "neil snape" <email@hidden>
To: "Ernst Dinkla" <email@hidden>;
<email@hidden>
Sent: Tuesday, October 14, 2003 8:00 PM
Subject: Re: RIP's for Photographers
>
on 14/10/2003 17:31, Ernst Dinkla wrote:
>
>
> Given the fact that several RIPs have problems to get the
>
> dithering good (banding) at the highest resolution of the
latest
>
> Epsons I don't see the disadvantage of the Epson screening
>
> either. Not to mention that Scanvec Amiable still hasn't a
good
>
> driver for the 7600/9600, one that includes the grey ink.
That
>
> there's a relation between using Epson dithering and less
>
> transparent colour control is another matter. Gimp-print's
>
> dithering is alright so what is actually the reason that RIPs
>
> show problems there ? Good dithering/weaving takes time in
RIP
>
> development and later on in actual printing, that could be a
good
>
> reason.
>
One reason there is banding on the Epson's with rip's compared
to drivers is
>
the rgb driver masks the paper line length bands that are shown
with good
>
linearisation. Let's just say that the rgb driver is over
inking to keep you
>
consuming ink but apparently covering the bands in the darkest
areas.
>
>
Neil Snape
If that was the case a simple turn of a sheet would show what
actually causes the banding.
Depending on the coating method of inkjet papers the
irregularities in the coating can be parallel to the head
movement (coater blade vibrations for example) or parallel to the
papertransport (wear of the blade or filth building up at the
edge .... yes there are more coating methods). I doubt that
papermaking irregularities actually are showing in printing but
the occasional batch where felt transport wheels didn't roll
properly or something like that and there are two or more
distinctive impressions over the length. That has been the
experience of four years with Hahnemuhle papers.
I normally read more complaints about little black ink used in Ep
son drivers. The grey in the 7600/9600 being an extension of the
black is also reducing the total ink considerably. Could be that
RIP manufacturers didn't recognise the change in total ink
delivered and Epson did but it is unlikely that there's that much
ink quantity difference to conceal paper/coating irregularities
in one driver and not in the other. Both profiled of course.
If there's a problem it could be in the phasing of droplet sizes
along the densities. That issue is revealed in the QuadToneRIP of
Roy Harrington (Gimp-print based) with the Epson 2200 where
shifts in that phasing did cure banding effectivily (but could be
printer dependent :-( .
On the Epson wide Format list is one report where Onyx seems to
have done something wrong in the driver according to the Epson
10000 user, Epson and Onyx. More RIP users complain however. With
a few exceptions there is no better dithering etc done by other
RIPs than is done with the Epson driver. One thing is sure, any
progress in the manufacturer's knowledge on that subject is never
translated to the older supported printer models. Gimp-print
shows that it is possible to make things better for older
printers too.
There is one user on the list who insists that the hardware of
the 7600/9600 should be blamed, wrong carriage motor that has
vibriations at 7.5 mm. The 9000 and 10000 models should have
better hardware.
So more opinions on the subject.
Checking the Scanvec site I see that they do not list the
7600/9600 anymore as supported printers. After two attempts to
write suitable drivers they probably have thrown in the towel.
Ernst
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