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Abstract

A method of preparing a hologram of an object on holographic material by a holographic laser exposure, by illuminating the object with white light and capturing the luminance values of the object using a detector having a filter which simulates the response of the human eye to luminance values and which detector is placed as if it were along the axis of the laser to be used for the holographic exposure and storing the luminance information as a positive image, illuminating the object with incident light of substantially the same wavelength as the laser light to be used for the holographic exposure and capturing the reflectance values from the object using a detector which is placed as if it were along the axis of the laser to be used for the holographic exposure and storing the reflectance information as a negative image, carrying out a holographic exposure of the object on to holographic material there being present in the object beam between the laser and the object light modulation means which represents the sum of the stored luminance and reflectance information and processing the holographic material to fix the holographic fringes therein. Preferably the white light employed is specular white light. The resultant hologram when reconstructed exhibits a similar reflectance and tonal range pattern to that of the object when viewed in a white light by the human eye.

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First Claim