uniformity in colour
Answers
Explanation:
The black plate is used to provide added uniformity of colour reproduction, since it will overcome changes in hue of critical neutral tones that could occur with random or cyclic variations in the amount of ink being transferred to the plate from the press inking system.
Answer:
The colour-space co-ordinates you use and thereby describe apparent visual uniformity in your book rests on two key factors. Firstly, you need a good quality colour measurement and calibration system to identify and specify individual colours, see for example the websites of Chromashare Photoshop and Datacolor. Secondly, you need a good colour mixture method and a robust and accurate quality control system that is capable of delivering the same colour time after time.
Explanation:
The Munsell system has pleasing visual-difference uniformity and its numeric scaling is specified by reference to the CIE Standard Observer XYZ tristimulus co-ordinates. However, as shown in the Luo and Rigg image, the XYZ co-ordinate space thus quantified does not directly represent numerically uniform colour difference space; and does not intended to quantify just-visible colour differences. The CIE1976 LAB uniform color system (more correctly the CIE L*a*b* model) is likewise specified by reference to the CIE XYZ values, but it actively seeks to linearize its scaling and maximize its colour uniformity of XYZ space. To achieve this the mapping from CIE XYZ values onto the CIE L*a*b* model is referenced to a large additional database of experimental visual difference judgements; and derived by a complex nonlinear three dimensional projection of XYZ space.