ALTANA Color-View - Manual (Page 59)

color-view™ Spectrophotometer User’s Guide
68
which reflected highlights or the
images of objects may be seen
as superimposed on the surface
(ASTM E 284, E-12)
Gloss, specular
1) the relative luminous
fractional reflectance of a
specimen
at the specular
direction (ASTM E 284, E-12)
2) the ratio of reflected to
incident light, x 100, for
specified
apertures of
illumination and reception when
the axis of reception coincides
with the mirror image of the axis
of illumination (ASTM E 284,
E-12)
Hitching Post Standard
standard close in color to the
samples being measured. This
standard is used for hitch
calibration of the instrument
Hunter L,a,b Scale
a uniform scale devised in 1958
for use in a color difference
meter, based on Hering’s
opponent-color theory of vision
Illuminant
a spectral power distribution for
a light which may or may not be
physically realizable as a source