Converting The Color Space Of Images While Printing; Creating Color Traps - Adobe PHOTOSHOP 5.0 User Manual

338 CHAPTER 15
Printing
Converting the color space of
images while printing
Photoshop has several color management features
to help you print a composite image on a printer.
To convert the color space of an image while printing:
Choose File > Print.
1
On the Macintosh, choose Adobe Photoshop
2
5.0 from the dialog box menu.
For Space, choose a color space profile:
3
Grayscale, RGB Color, CMYK Color, or Lab
•
Color to have Photoshop convert the image to the
specified color mode before the file data is sent to
the printer. If you choose a profile other than the
image's current mode, Photoshop uses the
conversion settings you specify in the Color
Settings dialog boxes.
Any other option (except Separations) to match
•
the file data to the color space of the specified
profile or output device.
Select Printer Color Management to instruct the
4
printer to convert the file data to the printer's color
space; for PostScript printers, the option changes
to PostScript Color Management. Select this
option only if you are printing to an RGB-based
printer or if you have not already converted the file
to the printer's color space.
Only PostScript Level 3 printers support
PostScript Color Management for images using
CMYK color space. To print a CMYK image using
PostScript Color Management on a Level 2 printer,
go back to step 2 and choose Lab Color.

Creating color traps

After you have converted the image to CMYK, you
can adjust the color trap. Trap is the overlap
needed to ensure that a slight misalignment or
movement of the plates while printing does not
affect the final appearance of the print job. If any
distinctly different colors in your image touch, you
may need to overprint them slightly to prevent
tiny gaps from appearing when the image is
printed. This technique is known as trapping. In
most cases, your print shop will determine if
trapping is needed and tell you what values to
enter in the Trap dialog box.
Note: Trapping does not affect existing spot channels
in the image.
A
Misregistration with no trap, and misregistration with trap
B