Journal of the Society of Motion Picture and Television Engineers (1950-1954)

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2.8 • 39 F x 208 F 2.4 " 2.0 1 1 1.6 o u § 1.2 0.8 _ 11 0.4 \ Fig. 5. Shift in the absorption U of a red glass, Corning No. VS. , 2408, Melt 1151, with change 00 i i i i 1 i , , i , i . y * in temperature. 400 500 600 700 Wave length (mp) Table I. Densities of Color-Compensating of the illuminance in the gate, with and Filters as Measured by the Densichron without the printer-balancing filters in Through the Tricolor Filters Shown. position. A comparison of these six Density to Kodak Filter will show whether slow drifts are due to Designation No. 29 No. 61 No. 49 lamp or to filter changes. Special care must be taken if glass fil GG-05G GG-10G GG-20G 0.06 0.10 0.16 0.04 0.04 0.05 ters are used in the printer, since many of Q'QS them, particularly the reds and yellows, GG-30G 0.28 0.07 0^06 show a large change in density with CG-40G CG-50G 0.33 0.43 0.08 0.09 0.06 temperature. This difficulty has been 0 • °6 met with in the use of both Corning No. GG-05M 0.03 0.06 0.05 2408, Melt 1151, and Corning No. 3384, GG-10M GG-20M GG-30M 0.03 0.04 0.05 0.10 0.16 0 28 0.06 Melt 600, glasses. The decrease in Q ' JQ transmission of the filter as measured by GG-40M 0.05 0.31 0 ! 1 2 tne Densichron may amount to 0.25 log / GG-50M 0.06 0.47 0.13 between room temperature and printer GC-05Y 0.03 0.03 0.09 operating temperature. Figure 4 shows GG-10Y 0.03 0.03 0.12 a typical curve of density to red light GG-20Y CC-30Y GG-40Y 0.03 0.03 0.03 0.03 0.03 0 04 0 • 23 against time for a Bell & Howell printer 0 ' 37 with Corning No. 2408, Melt 1 1 51 , in the GG-50Y 0.03 0.04 0*44 beam. The equilibrium temperature C. A. Horton: Color Printing Control 243