When viewed from the left, the other half of the interlaced image is visible with only the left facing lenses allowing us to see the images behind those lenses. When the image is viewed from the right, only one half of the interlaced image is shown, we are unable to see through the left facing lenses. With a two image lenticular print, the row lenses alternate with 50% facing left and 50% facing right. Hey presto, we now have a print that morphs and animates with two or more images. Examples of lenticular printing include flip.
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The interlaced series of images when viewed through the lenticular lenses now form a complete image once again. Lenticular printing is a technology in which lenticular lenses (a technology that is also used for 3D displays) are used to produce printed images with an illusion of depth, or the ability to change or move as the image is viewed from different angles. The interlaced image is very carefully and precisely laid on to the lenticular lens so that at any particular viewing angle only the stripes of one of the images is visible.
We now have our interlaced image, and a lenticular lens that matches the width of the interlacing. This measurement of thickness is called lenticules per inch, or LPI for short, and a second measurement called ‘pitch’ also dictates varying types of lenticular lenses. The width and thickness of the lenticules can vary and a correct lenticule thickness is selected based on the final intended viewing angle and viewing distance. Each ridge is actually a lens, and the technical terminology for each of these lenses is lenticules. It has a raised surface on one side which contain a series of ridges. A lenticular lens is a special sheet made of plastic. This is where the lenticular lens sheet comes in.
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