Re: Printer CMYK vs RGB gamut
Re: Printer CMYK vs RGB gamut
- Subject: Re: Printer CMYK vs RGB gamut
- From: Beisch Clemens <email@hidden>
- Date: Tue, 20 Nov 2007 14:16:46 +0100
Am 20.11.2007 um 13:41 schrieb Olivier Desmaison:
I read a strange statement: printer CMYK gamuts are narrower than
the same
RGB gamuts. Since it's the same device I'm puzzled.
Olivier
Hallo Oliver,
this statemant is correct, as long as you are talking about the same
device.
For example:
You can make a RGB printer profile for an Epson printer, using the
manufactures printer driver
or a CMYK printer profile using a RIP.
Printing RGB 0-255-255 to the printer using the epson driver will
result in a color patch of 100% cyan.
Printing RGB 255-0-255 to the printer using the epson driver will
result in a color patch of 100% magenta.
Printing RGB 255-255-0 to the printer using the epson driver will
result in a color patch of 100% yellow.
So, when you are measuring this patches using a spectro, you'll end
up with the same Lab values like
printing the CMYK patches with a RIP (my assumption in this example
is, that both, the printer driver and the
RIP are pre linearized to the same amount of ink per chanel).
The gamut must be the same.
The story of the small CMYK gamut comes from the fact, that most of
the printing presses deliver a smaller
gamut than RGB input devices like scanners, digicams or syntetic RGB
profiles like ADOBE RGB etc.
But this is a completely different strory.
Best regards,
Clemens Beisch
==============================
colorXact - colors are coming home!
First online ICC profiling software
register for free
http://www.colorxact.eu
==============================
Attachment:
smime.p7s
Description: S/MIME cryptographic signature
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden