RE: Printing Lab from Photoshop
RE: Printing Lab from Photoshop
- Subject: RE: Printing Lab from Photoshop
- From: "Henk Geesink" <email@hidden>
- Date: Tue, 7 Jul 2009 14:51:08 +0200
Mark,
My opinion is as a Epson Profocus dealer that the latest versions of Epson
printers that they all are CMYK printers and has in the driver a CMYK
conversion to its own CMYK space.
The principal is if you feed the driver with a color space differed then its
own color space it will be converted to its own. So if you feed a RGB / CMYK
/ LAB or what's else it will be converted to its own color space.
Henk Geesink
-----Original Message-----
From: colorsync-users-bounces+geesink=email@hidden
[mailto:colorsync-users-bounces+geesink=email@hidden] On Behalf
Of MARK SEGAL
Sent: dinsdag 7 juli 2009 14:18
To: Marco Ugolini; Ken Fleisher
Cc: ColorSync Users Mailing List
Subject: Re: Printing Lab from Photoshop
Marco,
My understanding of this is very similar. These printers are RGB devices in
the sense that they need to be fed RGB data; then the printer's internal
firmware converts the data to its own brand of CMYK for printing. If the
printer is fed anything but RGB data, the firmware reconverts the data to
RGB, then converts it to the printer's own brand of CMYK - I put it this way
because of course a number of the more recent printers use more inks than
CMYK, hence one would normally assume their conversion, screening and
dithering processes to be model-specific.
Mark
________________________________
From: Marco Ugolini <email@hidden>
To: Ken Fleisher <email@hidden>
Cc: ColorSync Users Mailing List <email@hidden>
Sent: Tuesday, July 7, 2009 1:10:28 AM
Subject: Re: Printing Lab from Photoshop
In a message dated 7/6/09 1:16 PM, Ken Fleisher wrote:
> If you have an image in Lab colorspace instead of RGB and you print from
> Photoshop with ³No Color Management², what values are sent to the print
> driver? How are the printer colors determined?
Ken,
>From what I know, Epson's drivers for their inkjet printers work like an
RGB
"black box" (with no direct access to its inner workings). With "no color
management" selected (in both Photoshop and the driver's own controls), my
guess would be that a conversion is taking place inside the driver itself
from the non-RGB source space (Lab included) to the driver's own device RGB
space. I'm not exactly sure how that is effected, though I'm pretty sure
that the driver functions as an RGB unit. Also, I do not think that the
conversion takes place in the application itself (be it Photoshop or another
one)
If the source space is already RGB, I would think that, with "no color
management" selected, the numbers go straight through without conversion --
similarly to what would happen in Photoshop by *assigning* a profile.
Marco Ugolini
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