What is interlacing?
Definition : The process of striping a sequence of images for animation effects, or views for 3D effects, and arranging them in order to a given pitch to be printed and viewed through a properly positioned and aligned sheet of lenticular lens material.
Interlacing is the key to the lenticular technology. The software place the frames in order and creates the file that you will print. It is mostly a mathematical formula that slices images to the right width and arrange them accordingly.
For a flip effect of 2 images, the first band is a strip from image 1, the second from image 2, the third from image 1, and so on. The software then saves the interlaced image in a file ready for printing. An image print is now produced whose characteristics represent a map of the interlaced images and which includes one or more desired visual effects. A very high end prepress system and RIP is used to process this file to print.
Interlaced file size: Number of Frames x Proofing Pitch LPI of the Lens x (resolution÷300) = PPI. For many lenticular document, it is usual to see file size as big as 500 MB and way over that.