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Lenticular - From Illusion to Reality



What is lenticular printing

Lenticular Printing is a method by which normally flat, static images can convey depth and motion. The "magic" of the image is an optical illusion created by a plastic sheet covered with many rows of tiny lenses.

An image must be specially prepared to match the lens. This image usually starts as multiple images. These images are interlaced together; that is they are sliced up into strips and blended together into one image. The size of these strips is determined by the lenticular lens that will be used, and the resolution of the printing device.

Each lens on the lenticular sheet magnifies a small portion of the image beneath it. As the viewing angle of the lens changes, a different portion of the image is magnified. That is why lenticular images appear to change as the viewing angle changes.



Stereoscopic principle

When our eyes observing an object, because of the two separate eyes level are in two different locations, we see the point of view of the objects are different,and the observed object image is different. Due to the existence of the aberration, through the brain we can feel a 3d world of depth stereo change, this is the principle stereo vision of human eyes .

One can feel three-dimensional with parallax (The difference between the image his or her left eye captures and the image his or her right eye captures). Lenticular technology is a special technology that makes use of parallax to create three-dimensional images by composing several images into one image in printing. In short, Lenticular technology creates three-dimensional images using the images viewed by the left eye and that viewed by the right eye through a semi cylindrical shape lenses and makes the image look as if they were changing or moving.


According to this principle, we artificially have created the kind of material - grating.

Real grating layer of the lens is a thin strip lens or transparent panels, hand touched is flat. The raw material is pet film, pet flakes, acrylic or ps plate, strip from the mold hot-rolled up. When we look at the past from the front of the grating, the lens through an article on end to see the back of the image. The image is not a normal plane patterns, but the fit and the width of the grating stripes bar graph. Bar chart is not a pattern, but several patterns superimposed.
We print this superimposed image on the back of the grating sheet or print to a paper and glued to the back of the grating plate.Seeing from a certain distance, you will see a lifelike three-dimensional image.For more,http://en.wikipedia.org/wiki/Lenticular_printing

Lenticular technology such as printing is the use of carefully shaped and precisely engineered small lenses, usually made of plastic in the case of printing, to create the illusion of 3D or animation without the need to use special visual aids such as red / cyan anaglyphic filters, shutter based or polariser 3D glasses. A series of these small strips of lens material layed next to each other display different images when viewed at different angles by the user. Essentially, when a user looks at the image from one angle they see one image and then looking from another angle a different image appears. For the image to give the impression of being 3D, the images must be of the same object but taken from different positions [usually the width of human eyes] but with the same focal point, the lenses then provide one eye with a view of the image taken from the left position and the other eye with a view from the right. The more dense the lenses are per inch, the more accurate and effective the 3D image.

The left diagram below shows a closeup of lenticular lenses on the surface of printed images and the right demonstrates in very loose terms how the technology can create the impression of depth.

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