Instrument Apertures & Accurate Dot Measurement

How to decide which aperture size is appropriate for your workflow when reading color bars or taking density measurements?The green section of the following table was extracted from ANSI CGATS.4-1993 Appendix C. It in turn refers to ANSI/ISO 5/4:1983. The last three columns illustrate compatibility with X-Rite's new instrumentation.

 

Nominal Screening Frequency		Sampling Aperture	X-Rite Instrument
lines/inch	lines/cm	minimum size (mm)	5xx Microspot	ATS Pub
65	26	3.5	NO NO NO
85	33	3.0
100	39	3.0
120	47	2.0	YES	YES
133	52	2.0	YES	YES
150	59	2.0	YES	YES
200	79	1.5	YES	YES
300	118	1.0	YES	YES