3nh / Sineimage X-Rite White Balance Chart White Balacing Test
Chart YE0178 for shading measurement
The test chart consists of a blank film between two glass panes.
The test chart is designed for shading measurement under the same
lightning conditions as other transparency measurements.
It is possible to perform shading measurements on illuminator (LG2,
LE6) without any chart. But then lightning conditions are different
to other measurements with test transparencies. By using a test
transparency the light intensity of an illuminator changes.
This is caused by two superimposed factors
a) the filter effect of the film and glass (25% light absorption)
b) the light remission of the transparency ack in the illuminator
While factor a) is predominat with th LG2, the remission factor b)
is predominant with the lightning sphere LE6, i.e. the light
intensity rises significantly when a test chart is inserted. To
carry out shading measurement under the same lighting condition as
other measurements the use of the YE0178 is essential.
Definition of white shading or white level uniformity
Determination of maximum white level variations in various areas of
the picture, when the camera is directed at an evenly illuminated
The values of the 11-graduated gray scale are as follows:
|Step||Density||Reflectance in %|
The density values are based on BaSo4 = 0. Two black fields and a
white field are located between the gray scales, the density of the
black filed is D > 2.4 (reflectance < 0.5 %). The density of
the white filed is D = 0.05 (reflectance = 89.9 %).