ANSI IT2.26-1998 pdf download Photographic Materials – Determination of Safelight Conditions
3.6ISO maximum safelight condition: Lighting condition that provides half of that exposure, which isthe geometric mean between the exposure required to produce the smallest detectable change and the(adjacent) maximum exposure that gives no detectable change evaluated by use of methods described inthis standard.
3.7 post-exposure (latensification): Safelight exposure after a sensitized material receives a normalimage-forming exposure.
3.8 pre-exposure (hypersensitization): Safelight exposure before a sensitized material receives a normalimage-forming exposure.
3.9 safelight: Combination of light source, filter, and fixture yielding a specific spectral irradiance appropriate for handling a particular sensitized material. Occasionally, the source itself may be spectrally correct without the need for a filter.
3.10 safelight filter: Spectrally selective absorbing material used with a specified light source to producethe required safelight illumination.
3.11 safelight fixture: Enclosure for a light source (such as tungsten) that dissipates heat and holds asafelight filter (if either are required).
3.12 safelight irradiance: Electromagnetic radiation emanating from a safelight that is incident on asensitized material.
NOTE – A sensitized material generally has a spectral sensitivity very different from the human eye. Thismakes it possible for two safelights of differing spectral power distributions to give the same “visual appear.
ance,” but affect a sensitized material quite differently.
3.13 safelight scale exposure: Exposure series using the safelight as the light source.3.14 safetime: Length of time that a sensitized product can be exposed to a safelight of a given intensityat a given distance. This will be any time less than or equal to one-half of the geometric mean between thetime required to produce the smallest detectable change and the maximum time that gives no detectablechange in a sensitized product, using the test conditions outlined in this standard.
3.15 smallest detectable change: Smallest difference in the image density or hue that, for a given sen.sitized product, can be seen in a side-by-side visual examination. This can alternatively be measured by adensitometer if it has accuracy of density difference and repeatability better than or equal to 0.5% or 0.005density, whichever is greater.
3.16stop: Term referring to a factor of two change in exposure, or a change of approximately 0.3 logoexposure.
3.17 subadditivity: Condition wherein the effect of successive exposures received by a sensitized prod.uct produces a net photographic effect that is less than that predicted by a mathematical summation of theindividual exposures.
3.18 superadditivity: Condition wherein the effect of successive exposures received by a sensitizedproduct produces a net photographic effect that is more than that predicted by a mathematical summationof the individual exposures.
ANSI IT2.26-1998 pdf download
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