Apparatus for making holograms including images of particular sizes

An apparatus for making holograms, comprising:

• a reference beam source for generating a reference beam;
• an object beam source for generating an object beam;
• a photosensitive material having a first surface and a second surface, said photosensitive material disposed in the beam paths of the beams generated by said reference beam source and said object beam source;
• an object assembly for sequentially transmitting multiple two-dimensional images of a plurality of data slices upon said photosensitive material, said object assembly configured to consecutively modulate said object beam in accordance with each of a plurality of data slices, respectively, and to direct said modulated object beams through a diffusing screen, wherein said diffusing screen being configured to be illuminated with digital data which forms a representation of an object and said diffusing screen being disposed to apply said modulated object beams into said photosensitive material;
• means for varying the apparent distance between said object assembly and said photosensitive material, such that each of said two dimensional images is transmitted onto said photosensitive material at a predetermined apparent respective distance from said photosensitive material;
• and,
• means for determining a first scale which is characteristic of said object, and means for re-scaling said first scale to obtain a second scale to be used in forming said representation of an object and in varying said apparent distance, wherein said second scale is calibrated with respect to said first scale.