If your wallPen is equipped with white printing, you can choose between different print modes:
CMYK:
The print is created using only the four colors Cyan, Magenta, Yellow, and Black.
W:
Only white ink is printed.
CMYKW:
All five colors are printed simultaneously. This mode must be selected, for example, when performing white calibration.
It is also required when only the actual white areas of a graphic should be printed in white. In this case, the alpha channel of the file must be created accordingly.
W+CMYK:
The right half of the nozzles prints white, while the left half prints CMYK. This creates a white background layer underneath the color image.