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References

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  1. R. S. Hunter, Natl. Bur. Standards Circ. No. C4-29 (1942), Eq. (9).
  2. See reference 1, Eq. (14).
  3. H. A. Robinson, J. Opt. Soc. Am. 36, 270–277 (1946).
    [Crossref] [PubMed]

1946 (1)

1942 (1)

R. S. Hunter, Natl. Bur. Standards Circ. No. C4-29 (1942), Eq. (9).

Hunter, R. S.

R. S. Hunter, Natl. Bur. Standards Circ. No. C4-29 (1942), Eq. (9).

Robinson, H. A.

J. Opt. Soc. Am. (1)

Natl. Bur. Standards Circ. No. C4-29 (1)

R. S. Hunter, Natl. Bur. Standards Circ. No. C4-29 (1942), Eq. (9).

Other (1)

See reference 1, Eq. (14).

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Figures (2)

F. 1
F. 1

Representative selection of reflectance curves of pharmaceutical powders.

F. 2
F. 2

Color maps of pharmaceutical powder samples plotted by a conventional method and by the new method (see text).

Equations (12)

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yellow index = 70 ( 1 - B / G ) , dark index = 0.5 ( 100 - G ) ,
yellow index = 70 ( 1 - R 455 / R 557 ) , dark index = 0.5 ( 100 - R 557 ) ,
β ( G - B ) / 10 G .
β = 700 Y 1 4 β .
β = 700 G 1 4 ( G - B ) / 10 G .
β = 70 ( G - B ) / G = 70 ( 1 B / G ) = yellow index .
L = 100 ( Y f ) 1 2 .
L = 10 Y 1 2 = 10 G 1 2 .
Δ L = 5 G 1 2 Δ G .
L = 0.5 G + C ,
L = 0.5 G + 50 .
dark index = 100 L = 0.5 ( 100 - G ) .