Replacing rich black

Rich black is a mixture of cyan, magenta, yellow and black. If rich black is used in an image, you can print the image with a reduced amount of cyan, magenta and yellow ink, or with only black ink. For each pixel in the image, the value of black is compared to the maximum value which is defined in the configuration file. If the black value exceeds or is equal to the maximum value, the amount of cyan, magenta and yellow ink is reduced.

To replace rich black

You configure the maximum value and the print values for cyan, magenta and yellow using the richblack property. Specify the:

•	Cyan value to print with the c.

•	Magenta value to print with the m.

•	Yellow value to print with the y.

•	Maximum value with the kmax.

Example 25

Printing with reduced amount of cyan, magenta and yellow

<property name="richblack">2,2,2,254</property>

In this example, the following applies:

•	A pixel with input values 7,240,8,253 is printed according to the input values.

•	A pixel with input values 7,240,8,254 is printed with 2,2,2,254.

•	A pixel with input values 7,240,8,255 is printed with 2,2,2,255.

 

Example 26

Printing rich black with black

<property name="richblack">0,0,0,254</property>

In this example, the following applies:

•	A pixel with input values 7,240,8,253 is printed according to the input values.

•	A pixel with input values 7,240,8,254 is printed with black (0,0,0,254).

•	A pixel with input values 7,240,8,255 is printed with black (0,0,0,255).