Image Types

 

Holograms can display a variety of patterns or images, including:

  • fully-three dimensional images (ie. exhibiting depth as well as the usual graphic dimensions of height and width)
  • kinetic geometric designs or patterns, exhibiting movement and colour changes
  • multi-channel images, containing two or more images, each in its own 'viewing channel. From different viewing positions a different image is seen or superimposed on the other image. The image changes are defined as flip (side to side movement), tilt (forward/backward rocking movement) or rotate
  • short animation sequences, which may be a computer-designed sequence or converted video scenes

 

The key types of hologram, as defined both by their appearance and their method of origination, are:

  • 2D - an image in the two dimensions of length and breadth, normally appearing on the plane of the hologram
  • 2D/3D - layered 2D images, in which at least one layer seems to lie behind or underneath the other
  • 3D - an image which has the three dimensions of length, breadth and depth
  • Stereogram - a hologram produced by recording many individual frames of a sequence of images to provide animation (see above). The original sequence may be photographic film, movie footage, video or computer graphics
  • Dot matrix (digital) - a design comprising many tiny dots or pixels which are too small to be seen by the naked eye, each of which is a separate hologram which together create a 2D or 3D image. Dot matrix holograms are created on a computerised origination system that exposes one dot, or pixel, at a time
  • E-beam - instead of using laser beams to record the hologram in a photo-sensitive emulsion, the very fine beam output of an electron beam generator is used to etch the pattern on the recording medium. This allows very high resolution and complex designs to be made
  • Composite or combination - it is possible to combine several of these types of image to create composite images, such as a dot matrix combined with a stereogram to give a multi-channel design of different types