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References

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  1. I. G. Priest, “A Proposed Scale for Use in Specifying the Chromaticity of Incandescent Illuminants and Various Phases of Daylight,” J. O. S. A. 23, 41 (1933).
    [CrossRef]
  2. Deane B. Judd, “The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetry,” J. O. S. A. 23, 359 (1933).
    [CrossRef]
  3. Private communication. Deane B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 25, 199 (1935).
  4. H. P. Gage, “Color Filters for Altering Color Temperature. Pyrometer Absorption and Daylite Glasses,” J. O. S. A. 23, 46 (1933). Although this development is based on Wein’s equation the results follow for Planckian temperatures within less than half a mired for temperatures below 5000°K.
    [CrossRef]
  5. Wratten Light Filters, 13th Ed., Revised (Eastman Kodak Co., 1934).
  6. R. Davis and K. S. Gibson, “Filters for the Reproduction of Sunlight and Daylight and the Determination of Color Temperature,” Bur. Standards Misc. Pub. No. 114, January (1931).

1935 (1)

Private communication. Deane B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 25, 199 (1935).

1933 (3)

H. P. Gage, “Color Filters for Altering Color Temperature. Pyrometer Absorption and Daylite Glasses,” J. O. S. A. 23, 46 (1933). Although this development is based on Wein’s equation the results follow for Planckian temperatures within less than half a mired for temperatures below 5000°K.
[CrossRef]

I. G. Priest, “A Proposed Scale for Use in Specifying the Chromaticity of Incandescent Illuminants and Various Phases of Daylight,” J. O. S. A. 23, 41 (1933).
[CrossRef]

Deane B. Judd, “The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetry,” J. O. S. A. 23, 359 (1933).
[CrossRef]

1931 (1)

R. Davis and K. S. Gibson, “Filters for the Reproduction of Sunlight and Daylight and the Determination of Color Temperature,” Bur. Standards Misc. Pub. No. 114, January (1931).

Davis, R.

R. Davis and K. S. Gibson, “Filters for the Reproduction of Sunlight and Daylight and the Determination of Color Temperature,” Bur. Standards Misc. Pub. No. 114, January (1931).

Gage, H. P.

H. P. Gage, “Color Filters for Altering Color Temperature. Pyrometer Absorption and Daylite Glasses,” J. O. S. A. 23, 46 (1933). Although this development is based on Wein’s equation the results follow for Planckian temperatures within less than half a mired for temperatures below 5000°K.
[CrossRef]

Gibson, K. S.

R. Davis and K. S. Gibson, “Filters for the Reproduction of Sunlight and Daylight and the Determination of Color Temperature,” Bur. Standards Misc. Pub. No. 114, January (1931).

Judd, Deane B.

Private communication. Deane B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 25, 199 (1935).

Deane B. Judd, “The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetry,” J. O. S. A. 23, 359 (1933).
[CrossRef]

Priest, I. G.

I. G. Priest, “A Proposed Scale for Use in Specifying the Chromaticity of Incandescent Illuminants and Various Phases of Daylight,” J. O. S. A. 23, 41 (1933).
[CrossRef]

Bur. Standards Misc. Pub. No. 114 (1)

R. Davis and K. S. Gibson, “Filters for the Reproduction of Sunlight and Daylight and the Determination of Color Temperature,” Bur. Standards Misc. Pub. No. 114, January (1931).

J. O. S. A. (4)

I. G. Priest, “A Proposed Scale for Use in Specifying the Chromaticity of Incandescent Illuminants and Various Phases of Daylight,” J. O. S. A. 23, 41 (1933).
[CrossRef]

Deane B. Judd, “The 1931 I. C. I. Standard Observer and Coordinate System for Colorimetry,” J. O. S. A. 23, 359 (1933).
[CrossRef]

Private communication. Deane B. Judd, “Estimation of Chromaticity Differences and Nearest Color Temperature on the Standard 1931 I. C. I. Colorimetric Coordinate System,” J. O. S. A. 25, 199 (1935).

H. P. Gage, “Color Filters for Altering Color Temperature. Pyrometer Absorption and Daylite Glasses,” J. O. S. A. 23, 46 (1933). Although this development is based on Wein’s equation the results follow for Planckian temperatures within less than half a mired for temperatures below 5000°K.
[CrossRef]

Other (1)

Wratten Light Filters, 13th Ed., Revised (Eastman Kodak Co., 1934).

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Figures (8)

Fig. 1
Fig. 1

Reciprocal color temperature as a function of the trilinear coordinate “x” for points on the black-body locus.

Fig. 2
Fig. 2

Energy characteristic of two Davis and Gibson filters. The straight lines are drawn through the data at 0.5 micron using slopes computed from the trilinear coordinate data.

Fig. 3
Fig. 3

Mixture diagram showing the design of a dark blue color temperature raising filter. The insert shows the effect on the color produced by adding various thicknesses of Amethyst B to 2.0 mm of Furnace Door Blue.

Fig. 4
Fig. 4

Energy characteristic of the dark blue filter shown in the preceding figure. This filter has a rating of about 61 mireds per mm.

Fig. 5
Fig. 5

Mixture diagram and energy characteristic of Pittsburgh Blue Plate. Although the color of the transmitted light is not exactly on the Planckian locus, its correlated color temperature is obtainable by plotting the appropriate isotemperature line.

Fig. 6
Fig. 6

Mixture diagram and energy characteristic of a dark amber filter rating about 99 mireds per mm.

Fig. 7
Fig. 7

Mixture diagram and energy characteristic of a medium amber filter rating about 22 mireds per mm.

Fig. 8
Fig. 8

Mixture diagram and energy characteristic of Fish-Schurman dark pink spectacle glass rating about 18.5 mireds per mm. The color match can be improved by a Noviol type correction glass.

Tables (2)

Tables Icon

Table I Wratten photometric filters.

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Table II Color temperature altering glass filters.

Equations (1)

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Δ ( 1 / θ ) = 160.7             Δ log T / ( Δ ( 1 / λ ) ) ,