Re: Printing Lab from Photoshop
Re: Printing Lab from Photoshop
- Subject: Re: Printing Lab from Photoshop
- From: MARK SEGAL <email@hidden>
- Date: Tue, 7 Jul 2009 05:17:48 -0700 (PDT)
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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