Computer Colour Matching Questions and Answers

Answer: C

Both are true and the reason gives the cause, and the factor is established from experience. Ignoring it produces a systematic shade difference at scale. The factor comes from accumulated experience. Ignoring it gives a systematic difference.

Answer: D

The first two are correct and reflect ordinary practice. The third is contradicted by experience in essentially every dyehouse there is. Scaling up always requires some adjustment. Conditions differ between the two scales.

Answer: A

Correct answer: accurate prediction combined with accurate dispensing

Right first time depends on both halves: a recipe that is right in principle and a dispensing operation that delivers it in fact. Failure in either produces a batch needing correction, which is why dyehouses that invest in matching software generally invest in automated dispensing at the same time.

Answer: B

Both are true and the reason gives the cost, and environmental impact rises with every reprocess. Prediction and dispensing both serve this objective. Environmental cost rises with every reprocess. Water and energy are both consumed again.

Answer: C

A high index warns that the match will fail under other lighting. The customer will see the goods under conditions the laboratory did not use. A high index is a genuine warning. An alternative recipe should be considered.

Answer: D

Correct answer: the fastness rating of the resulting dyeing

The system predicts everything that follows from the reflectance curve - candidate concentrations, predicted curves, colour differences and metamerism indices. Fastness is a property of the dye and the substrate that must be looked up from the manufacturer’s data or tested, and it is one of the reasons the colourist reviews the candidates rather than taking the top-ranked one.

Answer: A

Correct answer: the quality and currency of the calibration database

Everything the system predicts is derived from the database, so a database built carelessly or left to age will give confident predictions that are simply wrong. Instrument brand, computer speed and the sheer number of colourants held all matter far less than whether the calibration still describes the dyes and substrate in use.