Le Dossier 113: édition intégrale (Polar & Policier français) (French Edition)
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As I explained, future production will probably be concentrated on the negative, with the intention that it should be used both for exteriors and interiors, with a suitable compensating filter in the case of exterior work. BLAND: I notice that the preferred type of printer projects three separate beams through narrow band filters for analysis of the light.
These beams pass through different parts of the bulb and so will be subject to their different rates of blackening. Will this not upset the colour balance? In my experience lamps of this type are subject to rather rapid loss in light output through blackening of the bulb? What is the effective life of the lamp? Bland did not realise from the diagram that the light reaching the printing aperture is automatically controlled to a pre-determined value by the photoelectric cell assembly.
Therefore, change in light output due to blackening of the bulb is automatically compensated. At the present time this is secondary to the problem of getting sufficient exposure on the film. HOULT: You mention that when using film in daylight a Wratten 85 filter is recommended for colour temperature correction.
If is colour balanced for K, why is a Wratten 85B filter not recommended for this purpose?
- Sutton S.M..
In practice colour temperature of daylight varies over a wide range, so that a correction at the printing stage is nearly always necessary. In these circumstances it does not much matter whether an 85 or an 85B filter is used. Work is going on with a view to producing a series of colour correction filters intended for use with film. These will provide more specific colour correction under varying conditions of daylight.
LOMAS: In view of the amount of work which has been carried out on automatic masking methods in recent years, would it not be true to say that ideal subtractive dyes are impossible to obtain? Could he say from experience what a practical lower limit to the colour temperature would be, while still maintaining reasonable exposure balance in the three emulsion layers. Is it possible to correct, in the printing process, for daylight conditions other than this, so as to obtain a uniform effective colour temperature in the print?
For quantity production of release prints there are other methods which may well prove cheaper, but as the number of prints required decreases this discrepancy disappears, and may even go the other way. GOOZEE: No mention was made by the speaker of a colour chart to be used when shooting with Eastman Colour Negative so as to provide the laboratory with a check on the actual exposure conditions. Is it intended to provide such a chart?
At 25 feet or more, the chart and everything in the water surrounding it appeared greenish blue in the print but as the camera was brought nearer the chart the colour rendering improved until at a distance of five feet perfect colour rendering was obtained. I had the impression that the bead of developer might be hard to apply over a wide track in order to obtain a uniform density.
What sort of dynamic range is obtainable from the Colour Print sound track? THE AUTHOR: Undoubtedly some care is necessary in designing the applicator for sound track re-development, but no difficulty should be experienced in obtaining uniform re-development on standard tracks. Evans and J. Is there any reason why neutral density filters should not be used so as to be able to work at large apertures in bright lighting conditions?
THE AUTHOR: I do not know why you should find better quality at large apertures, but certainly neutral density filters can be used to cut down the light, always remembering that such filters are seldom truly neutral. This fact may lead to printing complications if intercutting is necessary between negatives exposed in various cameras, using an assortment of neutral density filters.
If only one neutral density filter is in use, there is no problem.
BUSH: With reference to the last question, at large lens aperture there is usually some image flare which lowers the overall contrast and desaturates the colours slightly. Generally speaking, the public seems to prefer this quality to the more saturated higher contrast result obtained at small lens apertures. As this film may not be available in sufficient quantity in this country, it is difficult to say what may happen in this respect.
- Imlichs Tale: A Woeful Buffeting at the Hands of Fate, or Accident, or Error?
- Kim (eNewton Classici) (Italian Edition).
Eastman Colour Negative Film is quite a flexible medium in the sense that other colour printing techniques can be employed apart from Eastman Colour Print Film. Black-and-white films, especially if used with light filters, will not require such complete correction in the lens as do integral tripack colour films.
A practical test with the particular lens and film is advisable. Whether this is granted will depend on the purpose the film is wanted for. So far as actual supplies are concerned, adequate quantities of all types should be available later this year. American practice, however, appears to be to make internegatives for all optical inserts.
LASSALLY: I thought that, apart from a slightly increased graininess, the internegative sequence we saw in the projected colour print matched extremely well with the sequence from the original negative. Craig, G. In: British Kinematography, 22,5, , pp.
In recent years, a number of negative and positive color films of the integral tripack type have been made available to the motion picture industry. Their use has been greatly encouraged by the flexibility offered by the negative-positive system, which enables a studio to produce color films with the same ease it does black-and-white.
This has been especially true more recently in the production of many three-dimensional films, where 3-D cameras taking single film strips are employed instead of Technicolor 3-strip cameras. In this respect, the new Eastman color films — three in all: color negative, color positive, and color internegative — have had wide use, and now that the manufacturer has increased the output of these films, their use will become even more general.
At present, nearly every major studio in Hollywood is using Eastman color negative in one way or another. Some are using the entire color series.
Examples are Warner Brothers, whose Warner-Color system employs Eastman negative and positive film, and Republic Studios whose Trucolor process also employs the full range of Eastman color films. Twentieth Century-Fox studio is using Eastman color negative in its cameras in the production of CinemaScope films.
Columbia Studio uses Eastman color negative in shooting all its 3-D films, with the release prints being produced by Technicolor Corporation. In all, Eastman Kodak now offers four different film materials which can be used in color productions, such as those outlined above, or which can be used in conjunction with existing commercial color motion picture production processes. Three of these materials represent improvements over earlier Eastman color films which were used in the last few years for a number of motion picture productions.
The most acceptable systems for color motion picture production require the use of intermediate steps in order to include special effects and to provide protection masters. A number of systems are possible when working from a color original, but the preferred system appears to be one employing black-and-white separation positives and an integral tripack-type color internegative, For this, Eastman Kodak has provided special film stocks.
The key film, of course is the negative. It can also be used with daylight or carbon-arc illumination when a Kodak Wratten filter No. It has a tungsten exposure index of about 24, and about 16 for daylight. These are only average specifications and, in many cases, satisfactory exposure can be obtained at even lower lighting levels.
This new film has somewhat lower graininess than the earlier Eastman color negative, and improvements have also been made in the colored couplers to allow better rendition of blue subjects. This results in a lower blue density for the processed film, which is advantageous in printing. The new Eastman color negative now makes it possible for producers of 35mm films in many fields to make pictures in color using any type of 35mm camera.
It is expected that soon we shall see newsreels in color, and more and more explorers and travel and documentary film makers are certain to turn to color, using Eastman color negative in portable Eyemo, Camerette, and Arriflex cameras. The new Eastman Color Print Film. Type 35mm and Type 16mm is similar to the earlier product, but improvements have been made to provide better image sharpness.
A new magenta coupler is also incorporated in this film which gives better rendition of red hues than was the case with the earlier film. Printing of the color negative onto Color Print Film can be done with either subtractive type printers employing color compensating filters, or with additive-type printers which utilize three filtered light beams obtained from three separate sources or from a single source with beam-splitters. In either case, the printer must be designed to permit adjustment of both the intensity and color balance of the light for printing each scene.
Additive-type printers have been found to give the best results from the standpoint of good color contrast and saturation. The sound track can be printed from conventional black-and-white sound negatives prepared in the usual way. Either variable density or variable width tracks may be used. It has been found that better frequency response is obtained if the sound track exposure is confined to the two top emulsion layers of the print film instead of to all three layers.
When effects are to be included in the production, black-and-white separation negatives are made through appropriate filters on Eastman Panchromatic Separation Film, Type , using registering-type printer. Preparation of such separations also provides protection against damage to the valuable color original or against possible fading of the dyes.
The separation positives are processed in a standard black-and-white negative developer by conventional methods. The separation positives are printed onto a new type Color Internegative Film Type using a registering printer. This new film has slightly higher contrast characteristics than the earlier film, hence requires somewhat lower contrast separation positives than was required for the earlier product.
As with the Color Negative, improvements have also been made in this film, with the result that there is better rendition of blue subjects.source
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The separate layers of the Color Internegative Film are exposed through the appropriate separations using filter packs of the proper type. Processing of the Color Negative, Color Print and Color Internegative Films is carried out in conventional type continuous processing machines, which provide for all of the steps required. These include, in addition to the washing steps, prebath for backing removal, color development, first fixing bath bleach, second fixing bath, and wetting agent or stabilizing bath.
Processing of the Color Internegative Film requires the same solutions as for the Color Negative, but a somewhat shorter development time is used for the former. Other solutions are the same. The accompanying schematic diagram illustrates the various steps in processing Eastman color films with the Eastman Color processing machine. Two additional diagrams show details of the power buffer, which removes the anti-halation backing on the films, and the sound track developing unit.
Development of the sound track is done by means of a bead-type applicator wheel, which dips into a small tray of sound track developer solution.