What is the difference between overprint and knockout?

What is the difference between overprint and knockout?

• A. Overprint prints colors on top of each other; knockout removes underlying colors where objects overlap.
• B. Overprint removes colors; knockout prints colors on top.
• C. Overprint creates new ink; knockout reduces ink usage.
• D. Overprint means printing only black; knockout means printing in color.

Answer: (A)

Overprint and knockout describe how inks interact when shapes overlap. Overprint means you print a color on top of another color, so the bottom color remains visible where the two overlap and the inks are laid together. This is handy for avoiding gaps due to small misregistration and can create richer results when colors are translucent or designed to trap. Knockout is the opposite: the area where the top object sits removes the underlying color, so the top color sits on a clean background with a sharp edge and no color mixing at the overlap. So the best choice captures this by saying one scenario prints colors on top of each other, while the other removes the underlying color where objects overlap. A practical example is printing blue on top of yellow (overprint) versus cutting away the yellow beneath a white shape (knockout) so the white shows clearly.

Overprint and knockout describe how inks interact when shapes overlap. Overprint means you print a color on top of another color, so the bottom color remains visible where the two overlap and the inks are laid together. This is handy for avoiding gaps due to small misregistration and can create richer results when colors are translucent or designed to trap.

Knockout is the opposite: the area where the top object sits removes the underlying color, so the top color sits on a clean background with a sharp edge and no color mixing at the overlap.

So the best choice captures this by saying one scenario prints colors on top of each other, while the other removes the underlying color where objects overlap. A practical example is printing blue on top of yellow (overprint) versus cutting away the yellow beneath a white shape (knockout) so the white shows clearly.