Additive and Subtractive Mixing Questions and Answers

Answer: C

Both are true and the reason gives the two mechanisms, and the proportions vary with the screen. The Neugebauer equations model the combination explicitly. The proportions depend on the screen used. Both mechanisms operate on the same sheet.

Answer: D

Correct answer: combining the primary colours weighted by their area coverage

The Neugebauer model treats a halftone as a spatial mixture of the sixteen Neugebauer primaries - paper, each single ink, each pair, each triple and all four - and adds their tristimulus values in proportion to the area each occupies. The subtractive part is inside each primary; the additive part is the area weighting.

Answer: A

Mechanical spreading and optical scattering within the paper both contribute. It must be characterised and compensated for in the separation process. Mechanical and optical causes both contribute. Compensation happens at the separation stage.

Answer: B

Each affects the printed result independently of the colour separation itself. Characterising the press and the paper together is what makes accurate reproduction possible. Press and paper must be characterised together.

Answer: C

It is bounded by the primaries available and by the maximum density achievable. No system can reproduce every colour a person can see. Primaries and density both bound the gamut. No system reaches every visible colour.

Answer: D

Both are true and the reason gives the limitation, and adding primaries enlarges but never completes the gamut. Out of gamut colours must be mapped to something attainable. Adding primaries enlarges but never completes it.

Answer: A

The first two are correct and follow from the geometry. The third is impossible, since real primaries always lie inside the spectrum locus. Real primaries can never reach the boundary. The triangle always lies inside the locus.

Answer: B

Something must be done with colours that fall outside what the device can produce. Clipping and compression are the two broad strategies available. Something must be done with unreachable colours. Clipping and compression are the two options.

Answer: C

Correct answer: A-2, B-4, C-1, D-3

Two mechanisms and two intents. Clipping moves out-of-gamut colours to the nearest point on the boundary, which preserves everything inside but flattens detail outside. Compression scales the whole range inward so that nothing is lost, at the cost of shifting colours that were reproducible. Perceptual intent takes the second approach and colorimetric the first.

Answer: D

Both are true and the reason gives the distinction, and photographs and logos need different treatment. Choosing the wrong intent produces a technically correct but visually poor result. Photographs and logos need different treatment.