Re: Grainy Laser Profiles
Re: Grainy Laser Profiles
- Subject: Re: Grainy Laser Profiles
- From: Graeme Gill <email@hidden>
- Date: Tue, 27 Jun 2006 23:26:31 +1000
Karsten Krüger wrote:
The 1250 uses a transfer belt.
Yes, you're right. But Xerox lost some ground to
Canon on the quality stakes when then moved from
the 400DPI non-transfer belt to the 600DPI transfer
belt 1250 IMHO.
I'm not going to race for dpi, and 600dpi is well below anything usable
for dot screening.
Of course, but all the high end Xerographic engines had multi-level
control of each pixel, the 400DPI machines having true 8 bit
response (albeit with a rather high transfer slope).
Compared to their predecessors (CLC700/800/900 and Xerox 57xx) there is
a huge advance in print quality.
I can't agree with this assessment. The Canon showed some subtle but
useful improvement in quality, the Xerox went backwards slightly,
just like Ricoh did when they moved to a transfer belt.
If you use a Splash server on your 1250, did you try dot screening
(hidden feature in G620 & 630, open feature in G640) ?
Splash were the opposition. On our Colorbus RIP we tried out a
variety of screening modes offered on the various copiers. The
"Map" mode on the Canons was interesting, but ultimately the best
quality was to run in "Photo" mode with the RIP doing true
anti-aliased oversampling. We didn't find that any of the screening
modes on the Xerox 1250 looked quite as good as the previous 400DPI contone
modes.
Memory and bandwidth issues are between rip and printer and should be
transparent to everybody.
Not to the designers of the interface cards (me!), the processing time
taken, or the cost of the RIP hardware. The extra expense and complexity
ultimately falls to the end user to pay for. As a cost for the copier
manufacturer to say "see, my DPI is higher than yours!", when the actual
quality remained about the same, or even went backwards, it seemed too high.
120.000 prints on a DC250 without service. Linearisation about every 3
days and no problems with black chanel or color so far.
Maybe they've improved things then. Certainly the Canon 1180's looked
great after a drum change and service, but then they got worse.
Graeme Gill.
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