EIA Halftone Gray Scale Chart (ST-51)

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Overall Size:    2.0 in. x 2.0 in.
    (50.8 x 50.8mm)
Image Area:    1.2 in. x 0.85 in.
    (30.5 x 21.6mm)
Step Size:    2.5mm x 5.0mm
Density Range:    0.222 to 1.523
Pitch of Dot Pattern:    0.010mm

The EIA gray scale pattern is a standard 2" square projection slide. It contains two parallel gray scales. The upper scale has nine nominally equal transmission steps while the lower contains the same number of nominally equal density steps. The transmission values range from 3% to 60%, corresponding to density values of 1.523 and 0.222 respectively. The slide is chrome on glass and densities are achieved by a fine halftone pattern.


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