Datacolor User to User Support Group.

I'm trying to profile my epson c2800 color laser. Unlike my epson 
inkjet r1800 which I can totally disable the color managment. For 
c2800, I can select [no color adjustment] under [color control], 
however, there is an option where I can choose 1.5/1.8/2.2 gamma value. 
The result can be very much different. Somebody suggests me to choose 
[icm]. Which is the proper way to do it? Tks

On most Epson printer driver user interfaces, the selection of "no color
adjustment" turns all color management off; in doing so, it also may turn
off the gamma adjustment as well depending on the particular printer driver.
The gamma adjustment traditionally was a way of adjusting for ink spread on
the paper in offset press printing, which depended on the ink and paper
being used; now it tends to refer to the location of mid gray on the
grayscale range of the display or print with respect to monitor displays and
inkjet printing.  Thus, the display or print will turn out lighter or darker
depending on the gamma setting.

 

To use a specific single, custom, or third party ICM color device profile
for a specific ink/toner and paper combination (or in some cases a set of
such combinations) from within the printer driver where you are letting the
printer do the color management, you need to have (1) the correct ICM color
profile for the printer/paper/ink or toner installed in the appropriate
location (i.e., folder) for your computer's operating system, (2) the
printer driver set to the ICM setting with under some printer drivers the
correct profile option selected from those listed in the ICM drop down box,
and (3) the color management control turned off in the image editing program
(such as Photoshop) or another application turned off so as to avoid double
color management.

 

If you are using Photoshop, Elements, or some other image editing program
that supports color management and allows one to control it from the
application itself rather than from the printer driver, it is typically
preferable to allow the application to control color management rather than
the printer driver or operating system.  To do this, one typically turns the
color management off  in the printer driver by selecting "no color
adjustment" and turning on the color management in the image editing program
where one would select the color profile to use for the printer.

From: colorvision_group@yahoogroups.com
[mailto:colorvision_group@yahoogroups.com] On Behalf Of ferdylau
Sent: Friday, June 27, 2008 7:37 AM
To: colorvision_group@yahoogroups.com
Subject: [colorvision_group] Profiling epson color laser

 

I'm trying to profile my epson c2800 color laser. Unlike my epson 
inkjet r1800 which I can totally disable the color managment. For 
c2800, I can select [no color adjustment] under [color control], 
however, there is an option where I can choose 1.5/1.8/2.2 gamma value. 
The result can be very much different. Somebody suggests me to choose 
[icm]. Which is the proper way to do it? Tks

Do you have a choice of an RGB driver as well as PostScript CMYK for
the Epson c2800 color laser ?
Mark

It is not a Postscript printer, so I don't have a choice.

The color gamut of the 2 profiles created by the above methods are too 
small(I compare them with hp p1215 color laser & CMYK). At the 
beginning, I guess it might be the nature of the printer, however, when 
I check its canned profile, it covers SRGB! Therefore, I guess I've got 
something wrong in printing the 729 color patches.

Inside the printer driver, under the color management section, I've the 
following selections :
- color adjustment (I can choose [no color adjustment] option which 
disable CMY, brightness, satur adjustment but allow me to adjust gamma 
value)
- PhotoEnhance
- ICM (disable all adj even gamma value)
- sRGB (disable all adj even gamma value)

Any suggestion? Rgds!

> That simplifies life...

How complicate to profile a PostScript color laser? In fact, I need 
to profile a Hp PS color laser cp3505 & I'm still finding how to 
disable the color management.

> The "raw" color gamut of the printer is shown in the printed 
target... if 
> you've used settings that actually get "raw" output. So you can 
see the gamut 
> right there, before you even measure or build a profile...
I don't quite get what you means here?

> I assume that you mean by this that you get brighter color from 
the canned 
> profile than from a custom profile... definately an issue with 
your settings 
> then...
I use [wincolor] utility to compare them

> You don't note which you have tried. You should be printing your 
target (as 
> well as your final prints) with the Color Adjustment: No Color 
Adjustment 
> setting selected.
I select Color Adjustment w/ no color adjustment & gamma = 2.2.

If you think the color adj is the right way to go, the created 
profile with extremely small color gamut (get too much gamut warning 
when soft-proof a CMYK test image, as compared to Hp color laser) 
should be correct. I just can't understand why the gamut of the 
canned profile has the same size as sRGB. Rgds!