Lenticular printing

1. A method of producing lenticular images, comprising the steps of:

providing photosensitive material;

providing a lenticular sheet in contact with said photosensitive material;

exposing said photosensitive material through said Lenticular sheet, wherein said step of exposing comprises using an optical imaging system to expose said photosensitive material through an additional lens-array comprising lenses having power only in one direction; and

wherein the optical imaging system has focal planes different in directions perpendicular and parallel to the lenticular sheet lenses.

2. The method of claim 1 , wherein the lenses of said additional lens-array are cylindrical.

3. The method of claim 1 , wherein the lenses of said additional lens-array are semi-cylindrical.

4. The method of claim 1 , wherein the lenses of said additional lens-array have non-zero aspherical coefficients in the sag determining equation.

5. The method of claim 1 , wherein the optical imaging system produces an image coinciding with the plane of the photosensitive material in the direction along the lenticular sheet lenses and an intermediate image within, on, or above the additional lens array in the direction perpendicular to the lenticular sheet lenses.

6. The method of claim 5 , wherein the focal plane of the optical imaging system in the direction perpendicular to the lenticular sheet lenses is conjugate to the plane of the photosensitive material relative to each pair of lenticular sheet lens and additional lens.

7. The method of claim 5 , wherein the focal plane of the additional lens array coincides with the intermediate image.

8. The method of claim 1 , wherein the pitch of the additional lens array is substantially the same as the pitch of the lenticular sheet lenses.

9. The method of claim 1 , wherein only part of the physical aperture of the additional lens array is used for reducing optical crosstalk.