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Anti-halation backing
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<h2 id="motion-pictures">Motion pictures</h2> <p>This effect is particularly pronounced in motion picture cameras. These cameras are subject to the constant motion of film being dragged through the film gate, so most motion picture cameras have film movements made or plated with wear-resistant alloys such as hard chrome. Given such a relatively reflective pressure plate behind the film, many motion picture films use an anti-halation (and anti-static) backing. Different kinds of effects can be achieved by removing the anti-halation backing.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> Halation is one of the properties unique to analog film stock<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> and isn't found in digital footage unless modified in <a href="/facts/Post-production/RpqM8yLl">post-production</a>. Despite anti-halation backing, most film stock still renders a slight red halo around the brightest elements in a picture, where the incoming light is so strong that it cannot fully be absorbed by the anti-halation backing, and instead is scattered back into the red layer of the stock, creating additional, halo-like exposure in that particular layer, before it gets fully absorbed. </p><p>Halation can be digitally imitated to some degree, as shown below: </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"PhotoNotes.org Dictionary - Anti-halation layer". Archived from the original on 2016-08-21. Retrieved 2009-07-21. <a href="https://web.archive.org/web/20160821052237/http://photonotes.org/cgi-bin/photo-entry.pl?id=Antihalationlayer" target="_blank">https://web.archive.org/web/20160821052237/http://photonotes.org/cgi-bin/photo-entry.pl?id=Antihalationlayer</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Anti-Halation Backing Removal". Vimeo. Retrieved 2019-06-16. <a href="https://vimeo.com/318726063" target="_blank">https://vimeo.com/318726063</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"On Color Science". www.yedlin.net. Retrieved 2019-06-16. <a href="http://www.yedlin.net/OnColorScience/" target="_blank">http://www.yedlin.net/OnColorScience/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> </ol>