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Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971)
[ACTIVE]

The Front-Projection Process of Composite Photography

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPTE
Volume
80, No. 9, pp. 685–691
Abstract
The development of a new screen material by 3M (Scotchlite 7610) has made possible the Front Projection Process, in which those portions of the projected image falling upon the actors are not visible, and shadows cast upon the screen by actors and foreground objects are not seen by the camera. The beaded Scotchlite screen is a reflex reflector, returning most of the reflected light back to its source. Gain is sufficient for one footcandle of background image intensity to balance a 200-fc foreground illumination. The very low illumination required by the Scotchlite screen makes possible background screens as large as 30,000 ft2 when using an arc projector. The practical use of front projection requires careful alignment of the camera and projector lenses to superimpose their front nodal points. The paper provides tables that define a safe minimum object distance as a function of screen distance, lens focal length and f/stop. Panning and tilting of the camera to follow action is permissible in front projection if the front nodal points are carefully aligned. By observing the limitations of the front-projection process, excellent results have been obtained. The paper explains these limitations and provides an operations check list.
Publication Date
1971-09-01
DOI
10.5594/J05742
ISSN
Print: 0361-4573
Link
https://doi.org/10.5594/J05742
Author(s)
Petro VlahosMotion Picture and Television Research Center, Association of Motion Picture & Television Producers, Inc., 8480 Beverly Blvd., Hollywood, CA 90048.
Copyright
© 1971 Society of Motion Picture and Television Engineers, Inc.
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Petro Vlahos; The Front-Projection Process of Composite Photography, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05742
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Petro Vlahos; The Front-Projection Process of Composite Photography, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05742

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Petro Vlahos; The Front-Projection Process of Composite Photography, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J05742
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<span class="citation">Petro Vlahos; <cite>The Front-Projection Process of Composite Photography</cite>, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971. Available at <a href="https://doi.org/10.5594/J05742" target="_blank" rel="noopener">https://doi.org/10.5594/J05742</a></span>

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Preview:
Petro Vlahos; The Front-Projection Process of Composite Photography, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971
doi: 10.5594/J05742
url: https://doi.org/10.5594/J05742
Snippet:
<li>
Petro Vlahos; <cite id="bib-10-5594-j05742">The Front-Projection Process of Composite Photography</cite>, Journal of the SMPTE ( Volume: 80, Issue: 9, September 1971); SMPTE, 1971
<span class="doi">10.5594/J05742</span>
</li>

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