Hallo,
I am a student from Brooks. I'm taking color management class right now
and I have some questions for you guys:
1. How many target patches are the best for paper profiling. I have
Bill Atkinson's target up to 4000 patches that I can read with
measurement tool. Does more pacthes = better accurate profile?
2. What resolution should I print these target patches? 1440 or 2880?
Does printing with 1440 vs 2880 will create different color? or can I
use one profile to print the other resolution and vise versa. Does the
myth 2880 > 1440 true? Can you tell the differences?
3.Will RIP help me to create a better printing quality?
I use Epson 3800 with Eye One Photo.
Thanks,
Dan Santoso
[{POST_SNAPBACK}][/a]
* I hope this isn't meant to embarrass the teacher next time :-)
1/ depends on the quality of the target creation, the ability to get consistent readings of such large targets and the software that has to cope with the measurements. there are some good arguments for printing more targets of smaller size and do more measurements that are averaged before profiling. Good when the printer isn't that consistent and the measuring has to be done by hand. Bill Atkinson's target is considered as one of the best around but his profiling method is in the same category so suit one another.
2/ there are inkjet models on the market that have claims they can be profiled with one profile for several resolution modes. The Epson 3800 is a first for Epson but the HP models have it all. The Epsons before the 3800 had a different inkload per resolution setting, a compromise in the use of the available droplet sizes per resolution. Check the manufacturer's profiles available for the printer models and you will see whether there's distinction made per resolution.
Be aware that for the Epsons at least the company advises not to use the speed (bidirectional) setting to make profiles for or print targets with, the order of ink lay down is reversed on the way back of the heads and by that the color changes between the strokes. This will be compensated partly by weaving but in the end there's a difference between uni- and bidirectional printing. As I understand it there has been a Canon printer that had two heads with reversed ink order to get that controlled in bidirectional printing. In printers that only do bidirectional and with the modern weaving, dithering methods + only small droplet sizes this may be less of a problem.
2a/ the myth stays a bit obscure in your message but I guess you mean print quality.
Depends a lot on the paper coating quality, printer consistency and what quality is asked for the job. The highest resolution usually suppresses any banding that may exist in the resolution below it (printer consistency, maintenance) may enhance gradations but in few cases it will actually add to better detail if one actually has the eyesight for that quality and the image file contains that detail for the printed size. With Epsons the Dmax may be better at the highest resolution compared to the one below it (the same compromise mentioned before). More a concern for B&W printing.
3/ that's meanwhile a myth. The RGB-device CM controlled normal printer drivers with good profiles will do 90 % of the jobs as good as a RIP will do those jobs. Meaning color and image quality on the usual media. RIPs (and that is a heterogene category meanwhile) still have advantages for special media, printers, workflows. On workflows there are often cheaper solutions available that will use the normal driver combined with cheap but good applications. The price of the software and skill needed to make profiles for CMYK device CM as used in 90% of RIPs is another factor to consider.
Ernst Dinkla
try: [a href=\"http://groups.yahoo.com/group/Wide_Inkjet_Printers/]http://groups.yahoo.com/group/Wide_Inkjet_Printers/[/url]