You could specific the number of layers required but we don't suggest our client to do so under normal circumstances. It is because the requirement will reduce the "scope of imagination" available for our designer who is supposed to the expert in the field. Moreover, lenticular 3 dimensional effect is artificially created with certain degree of imagination. It relies on the miniature lateral displacement among different layers to show up the effect. The more overlapping areas between different layers, the better the result will be. In fact, the number of layer is actually, to a certain extent, limited by your original graphic.
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All pictures can be maked into not only 3D painting,advertising promotion products,business gifts and 3D albums, also you can chose two or three pictures