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

Page scan 000229 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 #:
000229
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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_>> I •8 ¥ 3.8 3.4 3.0 2.6 2.2 1.8 1.4 1.0 6 Relative log E Fig. 4. Characteristic curves of Eastman Color Internegative Safety Film, Type 5243; red, green and blue printing density versus relative log exposure. this new film extends to longer wavelengths in the red region of the spectrum than that in the older material. This is to bring the maximum sensitivity close to the peak absorption of the cyan dye in the color negative, thus giving maximum contrast and color separation for any specified time of development. The present film contains a dye in the emulsion which is not fully removed during processing. This dye imparts a slight greenish tint to the processed film. The internegative film, Eastman Color Internegative Safety Film, Type 5243, contains the same color formers and has the same density range as Eastman Color Negative Film, Type 5247. The speed, graininess and sensitization are quite different. Figure 4 shows the sensitometric characteristics of this film. The minimum densities of the blue and green are higher than that of the red, owing to the presence of the colored couplers. The contrast is higher than that of the negative film, Type 5247. In this film, the magenta coupler is in the top, blue-sensitive layer, so that the blue exposure leads to magenta dye. The green exposure results in the formation of cyan dye, and the red exposure gives yellow dye. These noncomplementary relations between sensitizer and dye image are used in order to profit from two 220 March 1953 Journal of the SMPTE Vol. 60