What is Certification?
Certification is the formal recognition of the specialized knowledge, skills, and experience demonstrated by existing best practices and standards in the field of credentialing. Successful programs build on a foundation of core competencies identified and updated periodically by practitioners in the field. Volunteers at all experience levels and topic specialties legitimize the program through their participation at each stage of the process.
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Densitometry is explained well by Wikipedia as follows:
Densitometry is the quantitative measurement of optical density in light-sensitive materials, such as photographic paper or film, due to exposure to light. Optical density is a result of the darkness of a developed picture and can be expressed absolutely as the number of dark spots (i.e., silver nitrate grains in developed films) in a given area, but usually it is a relative value, expressed in a scale., Learn More >.