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

Page scan 000253 from Journal of the Society of Motion Picture and Television Engineers

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000253
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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This change of density of glass filters is, in general, due to a movement of the absorption edge toward longer wavelengths with increasing temperature. Spectral-density curves for the abovementioned red glass at two different temperatures are shown in Fig. 5. Though inconvenient, this density change with temperature need not reduce the accuracy of the printer control if sufficient time is given for the filters to reach temperature equilibrium before readings of the intensity are made. When printing through narrow-band filters, such as are used in making duplicate positives from a color negative or printing duplicate positives or negatives on a color print film, the analyzing filters should still be used in addition to the printing filters. When it is necessary to change to a print emulsion whose relative red, green and blue speeds are different from those of the emulsion previously used, the speed differences determined from sensitometry may be applied directly to the tricolor readings and the filter pack adjusted as indicated by the photometer. Similarly, if densitometry of the negative predicts timing changes to red, green and blue, these may be set up on the printer by means of the photometer. 244 March 1952 Journal of the SMPTE Vol. 58