GRA 424 Study Guide - Midterm Guide: Design Engineer, Iso 9000, Human Resource Management

• School: Ryerson University
• Department: Graphic Communications
• Course: GRA 424
• Professor: Martin Habekost

Document Summary

Can be a gauge for the printed ink film thickness. Varying density influences hue, chroma and value (lightness) of a colour. Cmyk: if you want same density achieved different ink film thicknesses will be used for each colour. Thick ink films absorb more light from the densitometer than thin ink films. The non-absorbed part is registered by a sensor. An almost linear correlation exists between ink film thickness and density. Even if the same density is displayed by the densitometer the ink film thickness may not be the same for all process colours. Densities should be monitored during the press run to ensure quality. Density tolerances should be +/- 0. 10, preferably +/- 0. 05. Densitometer -> white light shines down on colour and reflects back a colour to the sensor to measure the density. Dry ink films have a lower density than wet ink films (ink and paper dependent) .