Example2: Duotone object with overprint on ICC-tagged CMYK background

Given a duotone object with 70% Red and 30% black that is rendered with overprint on top of a background in ICC-tagged CMYK.

The duotone object uses the inks Red and black. The background must be identified as inks, so the ICC-tagged CMYK background is converted to regular CMYK. This conversion is performed according to ICC profiles that may be specified in the preferences. Suppose the background is converted to 20% cyan, 21% magenta, 22% yellow and 23% black. The overprint mode does not influence this.

 

Background object

Foreground object

 



Object type

not specified

not specified

Overprint mode

 

OPM 0 or OPM 1 (no difference)

Color space

ICC-tagged CMYK, converted to:

C: 20 %

M: 21 %

Y: 22 %

K: 23 %

Duotone:

Red: 70 %

Black: 30 %

The only common color is Black. There is no difference in overprint behavior between a spot color that is named “Black” and “Black” ink that is used to render the K plate of CMYK. The other colors are used either by the foreground object or by the background object.

The resulting color in the overlapping part of the objects (the intersection) will be as follows:



C: 20 %

M: 21 %

Y: 22 %

K: 30 %

Spot color Red 70 %