Some tests with the ET-8550

robwignell

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This has been a very interesting, and fast developing, discussion. I am amazed at the gamut volume figures - all above 1.2 million units. I use an old X-Rite DTP70 with ArgyllCMS to generate icc printer profiles for an Epson 7880 and an Epson 3880. I have OEM ink in the 3880 and get gamut volumes around 700K units. I have been experimenting with different inks in the 7880 including Marrutt, InkTec and ConeColor. For consistency in testing I use Kodak ULTRA Premium Photo Paper. It is high gloss and has relatively low OBA's. I have developed a patch set of just under 1000 9mm x 9mm patches. Typical results have less than ten patches with a DE > 1 and average DE <0.4. I would be interested to hear about the equipment and process that gets these significant gamut volume figures.
I ran some profiles on the ET-8550 and the L1800 to compare them , I'm using a 190gr PE/RC paper - no brand - and I'm using the paper selection 'Ultra Glossy' and the quality settings normal/standard and high/stark, the ET-8550 offers another quality level 'best', and there is one profile with the matte paper selection. The ET-8550 offers an additional option to modify the ink density from +20% to -50%, - somewhere hidden in the extended settings. The graphs below are an overlay of seven of these profiles showing the gamut volumes, they are almost identical and the actual profiles as well at different lightness levels. They vary by not much more than reading variations by the spectro.

View attachment 12858

The right plot shows the cross-section at the mid-luminance of L*=50, this following graph shows the cross-section at a lower luminance of L*=25, they are still pretty much similar

View attachment 12859

And this plot shows the profiles at a lighter luminance of L*=80, still pretty much similar.

View attachment 12860

The L1800 runs with light inks - LM and LC - the ET-8550 does not, but the above profile displays show that this does not make a difference at all - there is no gain at all in the lower quadrants - in direction of magenta or cyan. The ET-8550 and L1800 very much deliver the same color output - gamuts as shown here.

The ET-8550 runs with the Epson 114 inks as they came with the printer, I'm running the L1800 with the Epson 106 inks of the ET-7750, the fading tests earlier this year show that these inksets are not identical - the are slight variations on different papers but both inks overall perform very well in both aspects - fading and gamut.

There is a 114 PB photo black dye ink and a 106 PB photo black dye ink used in these tests, both inks deliver
a black level luminance of L*= 3.7 - 4.2 varying with the driver settings, these black inks are as well identical.

I'm not complaining but this shows that there is basically no improvement over the last 15 years in respect to the overall color output/gamut and fading performance. Printers got some other features like a duplexer and wireless connectivity options and a display at the printer but that's about it. Stay tuned - I'll play some more with the printers.
 

Ink stained Fingers

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I am amazed at the gamut volume figures
I'm using an age-old program Monaco Gamutworks to display V.2 icc-gamut files, other programs like Gamutvision or ICCview or Chromix Colorthink etc may give you very different numbers which you cannot compare, you only can compare gamut volumes as long as you use the same program to display/calculate the actual volumes, and yes - Monaco Gamutworks calculates higher numbers than e.g. Gamutvision. The ET-8550 runs on dye inks, your 7880 with pigment inks. I'm using the i1Profiler software with a i1Pro2 and a i1Io scanning table, results are pretty much in line with profiles from other sources e.g. paper suppliers.
 
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robwignell

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Thanks for details. I have an i1Pro2 which gives me access to i1Profiler but I only use it for screen profiling because it is much easier to use the much older DTP70 that scans a whole page at a time like the i1iSys. Apparently I can use the output from these scans in i1Profiler but I have been pleased with the results from using ArgyllCMS and haven't persued this option. I have been attracted to the ET-8550 since seeing a review of it in Luminous Landscape. Your review has strengthened my interest. Sorry if my comments are a bit off topic. It has been a great thread but I don't often see detail published on gamut volumes.
 

Ink stained Fingers

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Keith Cooper has published various videos and a review for the ET-8550

https://www.northlight-images.co.uk/epson-et-8550-printer-review/
He did various gamuts as shown in the video and review, you may contact him for those as long as you use them privately only.

Feel free to raise some more questions, I may be able to answer them - or not - e.g. I'm not using this/that option or feature like WLAN or..........I don't do B/W prints to any sophistication.

I just measured the profiles with 96 or 283 patches to catch the corners of the gamut which is enough for a first run to see the total volume, you would need a few more patches for more accuracy inside the gamut space. I'll do those as needed in the next time.
 

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I ordered inks for the ET-8550 - check the pricing in your country - the Epson 106 inks for the ET-7750 are signifiacntly cheaper in Germany than those 114 inks for the ET-8550 - 8,65€ vs. 12,65€ - which makes quite a difference. You easily can exchange the coded tops on the bottles. Both inks - 114 and 106 - are pretty much identical in terms of gamut and longevity/fading performance. You only need to buy the 114 gray, or dilute the photo black dye but I didn't test yet for the correct dilution ratio.
 
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