BS ISO 10505:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement instrument
  4.1 General
  4.2 Microdensitometer
  4.3 Spectral products
  4.4 Spatial frequency response
  4.5 Scanning motion
5 Instrument electronics
  5.1 Conversion to density
  5.2 Temporal frequency response of the instrument
  5.3 Instrument noise
6 Diffuse rms-granularity
  6.1 Optical geometry
  6.2 Diffuse conversion factor g
7 Preparation of specimens
  7.1 Sampling and storage
  7.2 Exposure
  7.3 Processing
  7.4 Specimen uniformity
  7.5 Sampled area
8 Operation of the measurement instrument
  8.1 Positioning the specimen
  8.2 Specimen scanning
  8.3 Control of focus
  8.4 Rate of scan
  8.5 Density mode
9 Method of test
  9.1 Principle
  9.2 Statistical background
  9.3 Construction of the median estimator and the
      95% confidence intervals
  9.4 Instrument noise
  9.5 Diffuse rms-granularity
  9.6 Uncertainty of the rms-granularity result
  9.7 Reporting results
  9.8 Summary of rms-granularity characterization
      parameters
Annex A (informative) - Typical viewing magnifications
        for critical naked-eye viewing
Annex B (informative) - Limiting the temporal frequency
        response of the measuring instrument
Annex C (informative) - The effects of specimen
        non-uniformity
Annex D (informative) - Derived constants c for subgroup
        sizes 10, 20, ..., 200
Annex E (informative) - Determination of sample size for
        specified precision and subgroup size
Bibliography

Defines a method for determining the intrinsic root mean square granularity (rms-granularity) of photographic films.

This International Standard describes a method for determining the intrinsic root mean square granularity (rms-granularity) of photographic films. Intrinsic rms-granularity refers to those density fluctuations produced solely by the distribution of developed image forming centres in the photographic emulsion.

Continuous-tone monochrome (silver absorbing species) and colour (dye absorbing species) materials coated on a transmitting support can be measured by the procedures described in this International Standard. This International Standard is intended for imaging systems with viewing magnifications between 5× and 12× (see Annex A).

The following kinds of granularity measurements are not covered by this International Standard, even though they are photographically important:

• reflecting materials (photographic papers);

• materials having emulsion coated on both sides of the support (e.g. some X-ray films);

• the estimation of the noise power spectrum (Wiener spectrum).