Given CMYK text rendered with overprint on a CMYK background.
|
Background object |
Foreground object |
|
|---|---|---|
 |
 |
|
|
Object type |
not specified |
Text |
|
Overprint mode |
||
|
Color space |
C: 10 % M: 20 % Y: 30 % K: 40 % |
C: 0 % M: 0 % Y: 0 % K: 50 % |
We’re dealing with CMYK text, which means that the resulting color in the overlapping part of the objects (the intersection) depends on the overprint mode:
- In standard overprint mode (OPM 0), a tint value of 0 % of one or more of the CMYK inks in the foreground object has a knockout effect on the underlying objects.
- In Illustrator overprint mode (OPM 1), a tint value of 0 % of one or more of the CMYK inks in the foreground object is ignored.
Depending on the overprint mode, the result will look like this:
| Standard overprint mode (OPM 0) | Illustrator overprint mode (OPM 1) |
|---|---|
 |
 |
|
C: 0 % M: 0 % Y: 0 % K: 50 % |
C: 10 % M: 20 % Y: 30 % K: 50 % |
But, suppose we convert the text to an image where all the pixels have the same color, i.e. 0 % cyan, 0 % magenta, 0 % yellow and 50 % black.
The foreground and the background object are in the same color space (CMYK), which means that the foreground image object defines the percentages.
 |
C: 0 % M: 0 % Y: 0 % K: 50 % |
The overprint mode is irrelevant in this case because an image is overprint-mode-independent.