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.
For this tutorial we'll keep things as simple as possible. Also you can order high quality lenticular prints from http://www.3d-leader.com.
We now combine with stereo image processing examples, introducing a three-dimensional image processing method.
In this example, an image to be processed is a picture of a hot air balloon image, has a clear three-dimensional sense, suitable for stereoscopic processing, as shown in figure 1.1.
Step 2: 1.1 Stereo Image Preprocessing
â Open the original image in the Photoshop , check the image size, its size as shown in figure 1.2.
Due to its resolution does not meet the requirements, needs to be modified for the resolution of 75.55 × 8=604.4lpi. But this time the document size is very small, so the document size is adjusted for high 6cm, width 8cm, then the size of the image data as shown in figure 1.3.
â¡ Mark the images of various parts of the stratification. It is divided into 8 layers, as illustrated in figure 1.4.
â¢ Separate those marked parts .
Use the pen tool to do the image matting, each balloon is selected, then cut; click on button on the lower right corner to create a new layer, and then paste those clipped layers to a new layer.
See the picture of original image after separating one layer ,as shown in figure 1.5.
The clipped part is separated into a new layer, as shown in figure 1.6.
Separate other layers according to the process above. Eventually all the layers are separated to the corresponding layer.
â£After all the layers are layed, the background will be incomplete, as shown in figure 1.7.
Because in the 3d stereo image, each layer in stereoscopic display will be of left and right displacement. Therefore, in the background , the blank area will be displayed. It is not reasonable, so it needs to complement the blank area.
The method to complement graph is to use the rubber stamp tool. Paste the other similar image to the blank area. In this way,the viewer would not see the unreasonable blank graph,even if the layer has displacement .
The effect after complementing graph as shown in figure 1.8.
â¤ Saved as PSD format, ready for further process by Psdto3D .
Step 10: Post Processing for Stereo Image
â Import the image above (PSD format) into Psdto3D software, the overall situation as shown in figure 1.9.
Imported image parameters as shown in figure 1.10.
The grating and a lens are not consistent with the actual data. Upon the determination, the actual raster resolution is 75.55lpi, so the grating will be changed into 75.55lpi , lens will be replaced in 8, focus and depth keep the same.
â¡Set the displacement value for each layer . When the above settings are adjusted, a displacement will be automatically generated . You can adjust a little as per the effect .The result is as shown in figure 1.11.
â¢Hook line for each single layer. preview the single layer after each end of hooking line for every layer . The hook line results as shown in figure 1.12.
â£After each layer being hooked line, observe effects combining with the preview , and make adjustment to achieve a desired effect . Preview the results as shown in figure 1.13.
â¤Output the final three-dimensional image. The image is derived as shown in figure 1.14
Now, we have finished the process of 2D to 3D conversion . Output the image to a paper, covered with the grating, and you can achieve the stereo sense on the vision.