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

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