>>12162229>transmission hologramsJust did some of these last week.
They work by recording the interference pattern where the film is between a reference beam and light scattered by the object.
The interference pattern at every point on the film (eg P1 or P2) is caused by the reference beam and light scattered from ALL OVER the object (A and B and C and...)
You can cut the film into pieces and still recover the full image of the object because each piece of film recorded light from all over the object. But if you had only the P1 film piece you would only see the object from the P1 perspective, you would not be able to see it from the P2 perspective.
The details in the interference pattern are what the image is reconstructed from and they have the same scale as the wavelength of light (eg 650nm for red). As long as a piece of film is big enough to fit several wavelengths the image quality will be high, so you might have to cut film down to something like 5000nm before you notice quality loss.
