TAILIEUCHUNG - Optics of Digital Cinema

How real are the women characters in Hindi films? This is something to debate about because values, ideals, principles; morals have dominated the frame-work in which these films are placed. Thus, women rather than being depicted as normal human beings are elevated to a higher position of being ideal who can commit no wrong. Their grievances, desires, ambitions, feelings, perspectives are completely missing from the scene. They are really portrayed as the „other‟ because they are shown as not belonging to this real and worldly life. For eg: Abhimaan (1973) begins with premise of the wife (Jaya Bachchan). | Optics of Digital Cinema G. P. Pinho Christie Digital Systems Kitchener Ontario CANADA ABSTRACT The wide acceptance of digital cinema depends on the ability of the projector to at the very least match film in color gamut contrast brightness and resolution consistently. In most cases digital projection is expected to even outperform film as a requirement for switching from film to digital because of digital projection cost. This paper examines DLP based digital projection and the optics required to produce an acceptable digital image that exceeds theatrical release film. Optical path efficiencies tolerances coating properties and the DMD are important parameters for color brightness contrast and uniformity of the image. The efficiency and tolerancing of the optical system are key drivers for obtaining consistent high brightness and uniformity while coatings and the DMD mainly affect consistency in color and contrast. DLP Cinema projection based on the optics discussed is shown to deliver a stable color gamut slightly smaller than film having consistent uniformity 300 K across a native white image with consistent brightness of 12 ft-L on screens up to 15 m. The contrast and resolution are native to the DMD but contrast can be influenced using apertures in the lenses and illumination system. Contrasts up to 3000 1 on off are possible by the use of asymmetric apertures. These results are compared to the color gamut contrast brightness and resolution of typical theatrical release film. Keywords digital cinema projector optics DLP cinema 1. INTRODUCTION In the last 7 years with the introduction of the Texas Instruments DLP technology a truly digital means of projecting an image with the performance to match and exceed film was introduced to the film community1 2. The TI digital micromirror device DMD showed the potential for high resolution contrast brightness and most importantly the potential to match the color gamut of film. In its current form DLP cinema is based on

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