Holography is a newer photographic technique. In conventional photography, a camera focuses the light reflected from an illuminated three-dimensional object and negative is made initially. Using the negative, a positive print is developed later. This positive print is the only two-dimensional view of a three-dimensional object.
Based on this, Dennis Gabor developed a novel photographic technique using interferometry. This technique is known as Holography, Holo means complete and Graphy means writing.
Pattern Difference: Hologram produced by Holography is a positive pattern while conventional photography, a negative pattern is produced on the film.
The Difference In Dimensions: Photography is the 2-D view of a 3-D object while in Holography, the viewer can see the image of the original object completely in 3-D form.
What Part of the Image Is Constructed?: In photography, if a part of the image is destructed, there is the loss of information corresponding to that object. But the same does not happen in Holography as each part of the hologram contains information about the whole object.
One Image Versus Many Images: Several images can be recorded on hologram at the same time. But in photography, a single photo film cannot help in recording several images.
Loss of Clarity: If a hologram is broken into pieces, each fragment is capable of producing a complete virtual image if an object though with reduced clarity. But in photography, what is lost once is lost forever.
Information Capacity: Holography has high information capacity as compared to photography.
Thus, Holography is much advantageous as compared to conventional photography as the reconstructed 3-D image can be studied at leisure in the former case.