Epson x900 & GMG issues
Epson x900 & GMG issues
- Subject: Epson x900 & GMG issues
- From: Martin Orpen <email@hidden>
- Date: Thu, 21 Jun 2012 12:53:18 +0100
If anybody on the list is using a GMG RIP to drive a 7900 or 9900, I'd like feedback on a quick test please:
1. Make a CMYK image in Photoshop that covers the width of whatever paper you're using and about 8-10 inches deep.
2. Fill the image with 100 cyan and 80 yellow.
3. Dump the image on the RIP and proof it on GMG Semimatte or Gloss using 8 colour mode and 720x720 resolution, bidirectional preferred, but doesn't really matter. It also doesn't matter if you've calibrated this setup or if you are running to SWOP or FOGRA39L or to a Custom Linear MX.
Note that this is a test of 8 colour mode -- not the usual 10 colour mode that the x900 machines use.
We cannot get this green (100c 80y) to print without both horizontal and vertical banding. The banding is gentle and looks like the green is moving from cyan to yellow -- more like moiré than mechanical issues you'd get with a head problem.
In 10 colour mode our 9900 prints fine -- but that may be because the cyan and yellow ink combination is replaced with mostly pure green.
I need to work out if this is a mechanical problem with a 6 month old 9900 or an issue with screening or inks?
It'd also be interesting to know if anybody else notices a rather strange effect caused by the vinyl strips in the print catcher -- if you leave that green print face down on the strips for 5 or 10 minutes you'll see that the inks that were in contact with them have gone dark and need a few minutes to recover their expected colour. Never seen that happening in 10 colour or with other colour combinations...
Appreciate it if anybody can help with this one and I'm more than happy to reciprocate if any other GMG/Epson users want tests run.
--
Martin Orpen
Idea Digital Imaging Ltd
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