Color Bars on Film for Setting up Telecines

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: The optimum values of the terms in the matrix representing electronic masking in telecines depends not only on the absorptions of the dyes in the film being scanned, but also on the inter-image effects present in the film system employed. Inter-image effects are often of a rather complicated nature even if only one film is involved, and if both negative (or camera-positive) and print films are used, then the inter-image effects occurring in both films and any that arise in the printing process must be considered. If, however, the camera film is exposed to a high level and a low level in each of its three layers in all possible combinations, then eight corresponding colors can be generated on the film being scanned; and if the electronic masking is adjusted so that the telecine outputs from these eight colors are also all at the appropriate one of only two levels, then, for those eight colors, allowance will have been made, not only for the absorptions of the film being scanned, but also for inter-image effects occurring in the system. By choosing the two levels of exposure on the camera film so as to correspond to those occupied by a light gray and a dark gray when exposed normally, the masking based on the eight colors can provide a good first approximation to that required in practice.
Publication Date: 1978-02-01
DOI: 10.5594/J17433
Link: https://doi.org/10.5594/J17433
Author(s): R. W. G. Hunt

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R. W. G. Hunt; Color Bars on Film for Setting up Telecines, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978. Available at https://doi.org/10.5594/J17433

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R. W. G. Hunt; Color Bars on Film for Setting up Telecines, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978. Available at https://doi.org/10.5594/J17433

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R. W. G. Hunt; Color Bars on Film for Setting up Telecines, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978. Available at https://doi.org/10.5594/J17433

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<span class="citation">R. W. G. Hunt; <cite>Color Bars on Film for Setting up Telecines</cite>, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978. Available at <a href="https://doi.org/10.5594/J17433" target="_blank" rel="noopener">https://doi.org/10.5594/J17433</a></span>

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R. W. G. Hunt; Color Bars on Film for Setting up Telecines, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978
doi: 10.5594/J17433
url: https://doi.org/10.5594/J17433

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<li>
R. W. G. Hunt; <cite id="bib-10-5594-j17433">Color Bars on Film for Setting up Telecines</cite>, SMPTE Journal ( Volume: 87, Issue: 2, February 1978); SMPTE, 1978
<span class="doi">10.5594/J17433</span>
</li>