HP Designjet T770 HP Designjet T770 & T1200 Printer series - Users Guide - Page 80

Color management from printer drivers, Color management options, Printer emulation

Page 80 highlights

Color management Color management from printer drivers Color management options The aim of color management is to reproduce colors as accurately as possible on all devices: so that, when you print an image, you see very similar colors as when you view the same image on your monitor. There are two basic approaches to color management for your printer: ● Application-Managed Colors: in this case your application program must convert the colors of your image to the color space of your printer and paper type, using the ICC profile embedded in the image and the ICC profile of your printer and paper type. ● Printer-Managed Colors: in this case your application program sends your image to the printer without any color conversion, and the printer converts the colors to its own color space. The details of this process depend on the graphics language that you are using. ◦ PostScript (PostScript printers): the PostScript interpreter module inside the printer performs the color conversion using the profiles stored in the printer and any additional profiles sent with the PostScript job. This kind of color management is done when you are using the PostScript driver and you specify printer color management or when you send a PostScript, PDF, TIFF or JPEG file directly to the printer through the Embedded Web Server. In either case you have to select the profiles to use as default (in case the job doesn't specify any) and the rendering intent to apply. ◦ Non-PostScript (PCL, RTL, HP-GL/2): the color management is done using a set of stored color tables. ICC profiles are not used. This method is somewhat less versatile than the alternatives, but is a little simpler and faster, and can produce good results with standard HP paper types. This kind of color management is done when you are using a non-PostScript driver and you specify printer color management, or when you send a PCL, RTL or HP-GL/2 file directly to the printer through the Embedded Web Server. NOTE: There are only two color spaces that the printer can convert to its own color space using the stored color tables: Adobe RGB and sRGB if you are using Windows, Adobe RGB and ColorSync if you are using Mac OS. ColorSync is the Mac OS built-in Color Management System; so, when you select ColorSync, color management is performed by Mac OS, and it is done based on the ICC profiles of the specified paper type. ColorSync is available with the PCL3 driver only. ColorSync can be selected under Mac OS X 10.4 from the Color Options panel: select Use Embedded (ICC/ColorSync) from the Source Profile drop-down list. Under Mac OS X 10.5, ColorSync can be selected from the Color Matching panel. You are recommended to consult the Knowledge Center (see Knowledge Center on page 188) to see how to use the color management options of your particular application. To choose between Application-Managed Colors and Printer-Managed Colors: ● In the Windows driver dialog: select the Color tab. ● In the Mac OS Print dialog: select the Color Options panel. ● In some applications: you can make this choice in the application. Printer emulation If you want to print a particular job and to see approximately the same colors that you would get from printing the same job on a different HP Designjet printer, you can use the emulation mode provided by your printer. 72 Chapter 8 Color management ENWW

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Color management from printer drivers
Color management options
The aim of color management is to reproduce colors as accurately as possible on all devices: so that,
when you print an image, you see very similar colors as when you view the same image on your monitor.
There are two basic approaches to color management for your printer:
Application-Managed Colors
: in this case your application program must convert the colors of
your image to the color space of your printer and paper type, using the ICC profile embedded in
the image and the ICC profile of your printer and paper type.
Printer-Managed Colors
: in this case your application program sends your image to the printer
without any color conversion, and the printer converts the colors to its own color space. The details
of this process depend on the graphics language that you are using.
PostScript (PostScript printers):
the PostScript interpreter module inside the printer
performs the color conversion using the profiles stored in the printer and any additional profiles
sent with the PostScript job. This kind of color management is done when you are using the
PostScript driver and you specify printer color management or when you send a PostScript,
PDF, TIFF or JPEG file directly to the printer through the Embedded Web Server. In either
case you have to select the profiles to use as default (in case the job doesn't specify any) and
the rendering intent to apply.
Non-PostScript (PCL, RTL, HP-GL/2):
the color management is done using a set of stored
color tables. ICC profiles are not used. This method is somewhat less versatile than the
alternatives, but is a little simpler and faster, and can produce good results with standard HP
paper types. This kind of color management is done when you are using a non-PostScript
driver and you specify printer color management, or when you send a PCL, RTL or HP-GL/2
file directly to the printer through the Embedded Web Server.
NOTE:
There are only two color spaces that the printer can convert to its own color space
using the stored color tables: Adobe RGB and sRGB if you are using Windows, Adobe RGB
and ColorSync if you are using Mac OS.
ColorSync is the Mac OS built-in Color Management System; so, when you select ColorSync,
color management is performed by Mac OS, and it is done based on the ICC profiles of the
specified paper type. ColorSync is available with the PCL3 driver only.
ColorSync can be selected under Mac OS X 10.4 from the
Color Options
panel: select
Use
Embedded (ICC/ColorSync)
from the
Source Profile
drop-down list. Under Mac OS X 10.5,
ColorSync can be selected from the
Color Matching
panel.
You are recommended to consult the Knowledge Center (see
Knowledge Center
on page
188
) to see
how to use the color management options of your particular application.
To choose between
Application-Managed Colors
and
Printer-Managed Colors
:
In the Windows driver dialog:
select the
Color
tab.
In the Mac OS Print dialog:
select the
Color Options
panel.
In some applications:
you can make this choice in the application.
Printer emulation
If you want to print a particular job and to see approximately the same colors that you would get from
printing the same job on a different HP Designjet printer, you can use the emulation mode provided by
your printer.
72
Chapter 8
Color management
ENWW
Color management