On Sat, 17 Oct 2015 16:24:08 -0700, Savageduck
wrote:

On 2015-10-17 22:16:47 +0000, Me said:

On 17/10/2015 16:04, Eric Stevens wrote:
I have previously written that the instructions for Epson Sure Color
P-800 recommend that with Photoshoop CS3 or later, All LR and also PS
Elements 6 or later - the printer should manage colours. I have
confirmed that with CC LR having the printer manage colors gives a
vastly superior result when using Epson Premium Glossy paper. I may
now have discovered why this should be.

Epson in conjunction with the Rochester Institute of Technology have
taken color management to new levels. The problem appears to be that
while with 8 colors there are a zillion ways to blend them to achieve
a particular color there is only one best way. Apparently the
mathematics are complicated but are vastly simplified by use of a
massive Look Up Table (LUT). Presumably all this is built into the
driver.

Down loading the driver results in about a dozen ICC paper profiles
being installed in Windows\System32\spool\drivers\color but these can
only be used with LR and the like. They cannot be loaded into the
driver which reports that they are incompatible (or some such).

My suspicion is that the LUT is available only when the printer
manages colors. I don't know why this should be but that's what it
seems to be. Apparently Epson's larger printers have been using this
for a while and it is now moving to smaller models.

http://factor.bg/epson/SP9900/Maximu...r_fidelity.pdf is a blurb
which doesn't really tell you much.

https://www.youtube.com/watch?v=egLCg3GiXIE is also a blurb but gives
more information.

Whatever the explanation I am banging my head on the wall waiting with
great impatience for a version of the driver which incorporates the
profile for Archival Matte paper.

I suspect that your observation may be the result of a mistake somewhere.

The photo you posted the other day of flower in a vase, I was going to
comment on. I didn't see any issue with it viewed on screen, and it
was also totally within gamut (R3880) on gloss/pearl papers. I viewed
the photo on a large TV with laptop connected, yet that had no problem
displaying the colours without any obvious posterisation or other
issues. I didn't look on my calibrated system.
I'm confident it would print fine using "printer manages colour" and
default settings for Epson paper stock.
But a problem exists if using non Epson paper... Probably not too bad
in some cases though, as for example, I've printed using "printer
manages colour" with Ilford papers and Epson settings for similar
papers, and the result is probably close enough for most people.
However on matte papers, it's a different story, some of the reds were
definitely out of gamut. Sure - you could try it out and see, but I'll
stick with soft-proofing and adjustment and a colour managed print
process to ensure that I get WYSIWYG screenrint matches - rather than
a lottery.
I guess with Epson matte/fine art papers, those adjustments to avoid
out of gamut and to tweak colour could be used by editing while
soft-proofing, then send to the printer and allow the printer to manage
colour. With non-epson papers or custom profiles - then no, it won't
work.

Ilford has icc profiles for their papers and most printers.
http://www.ilford.com/printer-profile-list

I would be suprised if they have one for the Epson LUT technology. I
suspect Epson may be reluctant to let others use it.
--

Regards,

Eric Stevens