Graphics Programs Reference
In-Depth Information
Fig. 6-19
Once a CxF data
file is saved, it can be
brought into ProfileMaker
Pro for use as a custom
white point for building an
ICC profile.
of optical brighteners using a check box as seen in Fig. 6-20. I can't under-
stand why a user would uncheck this box when these brighteners are
detected.
One way to detect if optical brighteners are being measured is to
examine the LAB values of the paper white. If a negative b* value is
measured, there is good reason to suspect optical brighteners. The other
test to perform is to produce a white document in Photoshop in LAB and
convert that to the printer profile in question using the absolute colori-
metric intent. If the b* value is negative as seen in the info palette set to
read that color model, the paper probably contains optical brighteners.
Do You Need a Raster Image Processor?
A Raster Image Processor (RIP) is a software product that can be used to
drive a printer and provide capabilities that the original print driver lacks.
Most photographers are unsure if they need a third-party RIP to drive
their desktop printers. Most designers and printers use RIPs because the
