It's generally advised that, when doing high quality printing on the Epson R2880, it is best to turn high speed printing off. My question is: Why?
First off, what exactly is high speed printing? According to the Epson help - when the "High Speed" is checked (under Quality Options) then bidirectional printing is enabled - that is, the print head prints in both directions. If unchecked then it only prints in one direction - making the time to print slower since the print head is, effectively, crossing the page twice as many times.
But why does this affect the quality of the print? I'm just wondering if this advice is a carry over from older printers where there was a legitimate problem of printing not lining up precisely when printing in both directions. Has there been any testing to prove that this is still a problem in the latest printers?
#1. "RE: High speed printing on Epson R2880" | In response to Reply # 0blw Nikonian since 18th Jun 2004Thu 11-Mar-10 07:54 PM
I found that there was no problem using bidirectional mode on my 7600 - which is earlier than your 2880 by a good long time. I only tried in 720 dpi mode and 1440 dpi mode - perhaps some other scheme shows the problems more, I dunno.
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#2. "RE: High speed printing on Epson R2880" | In response to Reply # 0esantos Nikonian since 10th Nov 2002Thu 11-Mar-10 08:38 PM | edited Thu 11-Mar-10 08:39 PM by esantos
I don't recommend it for final output. For proofing and non-critical work you should be okay. When you select high speed printing or bi-directional you are introducing three issues. 1) By printing in both directions as the print head sweeps across the paper and back again you are laying down ink in both passes. This lessens the time the ink has to absorb into the paper coating. If you were using an non-coated paper this probably would not be an issue. But if you are using a coated paper you risk ink smearing. 2) The driver uses a different algorithm when set to bi-directional printing. This will affect the quality of the print since it uses less accurate screening methods (half-toning algorithms). 3) Unless the head is accurately aligned you may get some alignment errors when printing in both directions. This can be corrected theoretically by performing a head alignment frequently.
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#3. "RE: High speed printing on Epson R2880" | In response to Reply # 0HBB Charter MemberFri 12-Mar-10 09:10 PM
I have always turned the high speed, bidirectional option OFF when printing on my large format printers, going back to the Epson P4000 several years ago. I tend agree with Ernesto: when printing on matte papers, the ink is probably absorbed faster than is the case with coated stock.
On my Epson P7900 printer, I can set the delay per pass at any value up to five seconds. To date, I have left the delay at zero seconds, relying on the uni-directional printing, and have never observed any ink smearing problems. I almost always use Epson papers.
Not all paper and ink combinations are compatible (e.g., Epson ink and non-Epson paper), and ink drying times can vary unpredictably. The Epson P7900 manual states: "Drying time per print head pass lets you print with non-Epson media and avoid smearing the ink. You can make the print head wait up to 5 seconds after each pass to allow ink to dry on the page."
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#4. "RE: High speed printing on Epson R2880" | In response to Reply # 0billg71 Nikonian since 14th Aug 2006Sat 13-Mar-10 12:09 AM
Jeff Schewe says that as long as you do an auto head alignment there's no reason to not use bidirectional(high-speed) mode on the -800 series Epsons and newer.
I've run my 3800 and 4800 both ways and personally can't see a difference with an 8x loupe. If a profile I'm using specifically says to use uni mode I'll do it, otherwise I run high-speed.
YMMV, of course...
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