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Influence of the angle of vision on the desired effects for lenticular lenses:
Preamble
Offset printing of lenticular to its limits. The screen rulings used vary according to the printer (300, 400, 600 lpi) and its ability to reproduce a woof with a body without fattening enough. The size of the dot is determined by the screen frequency and point value (we will not consider the shape of the point). For example, with a line screen of 400 lpi and value frame of 50%, the dot has a size of 31.75 µ (25.4 mm / 400 * 50%). However, it remains invariable axis between 63.5 µ (25.4 mm / 400). In other words, a network of 75 LPI lenticular with a pitch of 336µ, a printing frame 400 line screen printing that does 5 points for a colour within a duckweed (336 / 63.5 = 5.29). Consisting of a master interlaced image, is it unrealistic to think that a dot can participate in the printing of more than an interlaced image ? Can we conclude that the maximum number of images that can be printed in 400 line screen is 5 images? Let us not forget that in general the prints are full colour (4 colours), expansion of colours ensemble, has for accordingly an increased definition. Experience shows that for a network of 75 LPI and 400 line woof printing in full colour, an intertwining of twenty images is reproducible. The foundations are laid and you can calculate yourself the maximum number of images that are somewhat reasonably reproduce for another network and another screen ruling.
Animations
Ideally for the lenticular lenses, for animations, is to have a vision widest angle possible. Indeed, the goal is to scroll very slowly as possible the sequence of animation to allow to have a wider viewing focused on the image same. The images will be "cleaner", at least, less disturbed by the images adjacent.
The relief images
For 3D this is the opposite, in fact we have to find the right compromise. The lenticular lenses have a viewing angle closed this is allow to our eyes observe a maximum of images (a image gap more significant for the same angle), which will increase the depth of the relief. For cons, the phasing in printing will be more difficult to maintain.
See too : lenticular print.
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EUROPE
