Frequently asked questions to the lenticular technique.
Which specific steps are necessary to produce a 3D lenticular image?
1. load images in the program
2. calculate the lenticular image
3. print the image
4. put the lenticular card over the image and fix it. Ready.
Step by step instructions are explained in
great detail in chapter 3 of the manual.
The different methods on how to fix lenticular cards on a printed image are explained in chapter 4. Chapter 5 gives you extensive
information regarding how to produce basic images.
The lenticular card has a smooth and a structured surface. Which side has to be turned towards the printed
image, which side has to be turned to the viewer?
The structured surface, this is the lenticular, has to be turned towards the viewer, the smooth surface contacts the printed image.
How can the lenticular card and the printed image be fixed exactly?
There is a detailed instruction manual in Chapter 2.15 of the manual.
Why is it necessary to take e.g. 10 images instead of the usual 2 basic images when applying the 3D
Both eyes look at the lenticular with different angles. Also, because of the distance of the eyes which is different and individual and because of the
flexible view on the 3D-image (distance and angle). Therefore, 10 different basic images guarantee that you will always see at least 2 different basic images, even if you move your
head or if you move the lenticular card. If you have 3D lenticular images with only 2 basic images, e.g. an anaglyphic image, the lenticular card has to be looked at from a certain
angle and distance to obtain an 3D effect. In case you have different angles or viewer positions, the basic images can even be exchanged. As a result, you would not have a 3D effect.
Do the lenticulars have to run horizontal or vertical?
This depends on how you want to use it. The
lenses run horizontal with flip images and animations. The single images can be seen if you tilt the lenticular card over to the front or to the back. The lenticulars run vertical on
3D images. The left eye looks with a different angle on the lenticular card compared to the right eye. Both eyes see different stripes of the 10 single images.
Are there any differences with the lenticular material?
Yes, there are differences. Lenticular material differs concerning material, lens density and view angle.
Can I save the new produced lenticular image as a JPEG-image?
We advise you against doing that. The
use of JPEG lowers the needed saving space on the computer but distorts the image. JPEG belongs to the so-called compressions with losses of information. In fact, the losses of images
are low but if you use a lenticular, each single detail is important.
Basically, all graphic file formats that do not cause image losses while saving/compressing can be used such
as Windows BMP-format. JPEG can be used though when loading single basic images.
Is it true that a 3D effect rises if the number of single images rises as well at the same moment?
No, that is not true. There are different series of single images and they depend on the view angle of the lens and on the distance between eye and lenticular cards. The rise of the
number of single images has a positive effect on the general impression though because picture jumps between single images can be reduced when moving the picture.
Can I print the lenticular card directly?
There are several reasons against printing at home:
- it is not possible to position the lenticular card exactly without any shift or distortion before and after the print process
- the ink of the normal ink jet printers are not suitable to print on films
- lenticular material is very rigid and therefore, when trying to bend it could damage the printer
Even if lenticular material is used which has a special film on the back side and can be bent easily, there is
still the above mentioned problem to position it correctly. Lenticular material can be printed directly when using professional print machines.
Is the production of lenticular cards a new invention?
No, first works started in 1896. The
lenticular technique was further developed in the middle of the 20th century especially by the Frenchman Maurice Bonnet.
With the improvement of the technical possibilities and
the lowering of the production costs, 3D postcards in bigger amounts were produced in the 50s and especially in the 60s of the 20th century. But since some years home equipment such
as computers and printers have attained the efficiency and precision to produce lenticular prints.
How can I produce my own 3D-images?
3D-images can be produced by
even and constant shifting of the camera and also by the use of a rotating plate. Another 3D-source is artificially produced images, e.g. the use of 3D graphic programs (e.g. POV-Ray)
or screenshots of 3D computer games. Furthermore, 3D effects can be reached when 2D-images are shifted in 3D space (e.g. a flat photo or text information in front of
3D-backgroundimages). The single images out of a short film taken by the camcorder are usable as well.
Chapter 5 of the manual contains detailed information to this topic.
Where can I buy lenticular cards?
Lenticular cards and other 3D products can be purchased in the 3D-Easy-WebShop. You can find more and present information on the 3D-Easy - Homepage under www.3D-EASY.de .
Are there any
differences between conventional 3D images and 3D lenticular images concerning the 3D camera perspective?
There are only a few differences: The theoretical distance between
both eyes should be
extended (about factor 1.2...2) because normally the viewer is not able to see both outer images (image stripes) at the same time. On the other side, the images
should be photographed and aligned the way that the object is mainly behind the image surface. There is detailed information to this topic in chapter 5 of the manual.