A picture that shows a different image or appears to move when viewed from different angles is typically created using lenticular printing.
Understanding Lenticular Printing
According to the provided reference, lenticular printing is a technology that uses lenticular lenses to create printed images with an illusion of depth or the ability to change or move depending on the viewing angle.
Imagine tiny, parallel lenses placed on top of an interleaved image. The image itself is made up of slices from two or more different pictures. When you look at the print from one angle, the lenses refract (bend) light to show you only the slices from one image. As you change your angle, the lenses shift which slices are visible, revealing the second image, or even creating an animation effect by showing a series of images in sequence.
How it Works Simply
- Interlaced Image: Multiple images are sliced into thin strips and then combined into a single, interlaced image file.
- Lenticular Lens Array: A plastic sheet is created with a series of parallel, convex (curved outward) lenses on its surface.
- Assembly: The lenticular lens sheet is carefully aligned and laminated onto the interlaced image.
- Viewing: The lenses direct your view to different strips of the interlaced image depending on the angle you look from, making the picture appear to change.
Common Applications
This fascinating technology is used in many everyday items:
- Novelty items: Rulers, stickers, postcards that show changing images.
- Advertising: Posters or signs that grab attention with moving or changing visuals.
- Packaging: Product boxes that have depth or flip images.
- Collectibles: Trading cards or memorabilia with 3D or animation effects.
- Identification: Some ID cards or licenses use lenticular features for security.
Effects Achieved with Lenticular Printing
Lenticular printing can produce several visual effects:
- Flip: Two (or sometimes more) distinct images alternate as the viewing angle changes.
- Animation: A sequence of images creates the illusion of movement.
- 3D: Different perspectives of a scene are shown to each eye, creating a sense of depth without special glasses.
- Morph: One image smoothly transforms into another.
| Effect | Description |
|---|---|
| Flip | Switches between 2+ distinct images. |
| Animation | Shows a sequence of images for movement effect. |
| 3D | Creates depth perception. |
| Morph | Transforms one image into another. |
In essence, lenticular printing is the technology behind those engaging visuals that surprise and delight viewers by presenting different content based purely on their perspective. It's a clever combination of optics and image preparation.
