Ask experts for technical problems of grating stereoscopic painting.

Characteristics and processing methods of grating thin films

At present, the popular grating materials in the domestic grating stereoscopic picture market are mainly divided into two categories: grating plate and grating film.

Grid plate is a one-step molding production technology, which has the advantages of simple use and high transparency, but at the same time, it also has some shortcomings such as limited size, difficult splicing, high price and high transportation cost.

Grating plate (professional name: coiled cylindrical mirror grating) can not be used directly, and it needs secondary processing by users to become a real grating plate. However, the grating film is still a bright spot in the grating material family because of its low price (only about one-tenth of the grating plate formed at one time), easy splicing, easy transportation and flexible use.

First, the use of grating films.

1. The grating film must be attached to transparent media (acrylic board, PET board, PS board, PVC board or even glass board) with fully transparent double-sided tape to form a real grating board.

2. First, stick the fully transparent double-sided adhesive tape on the fully transparent medium with a cold sticking machine. Note: the pressure roller must be pressed evenly (until it can't be shaken by the handle, and the pressure roller should be turned by hand during cold installation), and no impurities or dust can be mixed between the transparent adhesive and the transparent medium during installation.

3. Bonding the grating film on the fully transparent double-sided adhesive tape with a cold bonding machine. Note: the pressure roller must be pressed evenly (until it can't be shaken by the handle, and the pressure roller should be turned by hand during cold installation), and no impurities or dust can be mixed between the grating film and transparent adhesive during installation.

4. In the process of installing the grating film, be careful not to pull the grating film to avoid its deformation.

5. The thickness of transparent medium depends on the effect of grating plate and the focusing range of grating film: the thickness of 3D grating plate is thicker; The grating plate of 2D map is thinner; However, the grating plate thickness of the "3D+2D" combined effect is in the middle. Generally speaking, grating film manufacturers will give requirements and suggestions on the thickness of transparent media.

6. The cost of transparent media from high to low is: acrylic board, PET board, PS board, PVC board and glass board. The greater the thickness, the higher the cost of the transparent medium.

Second, 32-line grating film

32-wire grating film is the earliest grating film material used in China, with stable performance and wide application range? Do you mean to invade the spectrum? Where's the skirt? What is the difference? Br> 1, made of PET polyester material of DuPont Company, continuous drum molding, wireless distortion.

2. The grating density is 3 1.8 188 lpi (or 0.7982mm).

3. The thickness of the grating is151filament.

4. Applicable transparent medium thickness (or optimal focusing distance): 4 mm ..

5. The field of vision is 23 degrees.

6. Optimum observation distance: 1 ~ 4m.

7. Applicable fields: stereoscopic advertisement, stereoscopic wedding dress, stereoscopic decorative painting, stereoscopic children's painting, etc.

8. Packing specification: width1.20m or1.22m, length100m, in drums.

Thirdly, 24-line grating thin films.

24-wire grating film is a new member of grating film family. By adjusting the thickness of the transparent medium, the 24-line grating film can conveniently realize 3D stereoscopic effect, 2D stereoscopic effect and "3D+2D" combined effect, and can be used to make various stereoscopic or variable-picture grating pictures. The appearance of 24-line grating film products of Henan Xinshijie Technology Co., Ltd. has alleviated the pressure of out-of-stock of domestic variable image grating materials to some extent.

1, made of PET polyester material from Dupont Company, USA, with continuous drum molding and wireless distortion.

2. The grating density is 24.0076 lpi (or 1.058mm).

3. The thickness of the grating is 17 1 filament.

4. Applicable transparent medium thickness (or optimal focusing distance): 2.5~3mm.

5. The viewing angle is 30 degrees (the thickness of transparent medium is 2.5 mm) or 60 degrees (the thickness of transparent medium is 3 mm).

6. Optimum observation distance: 2 ~ 15m.

7. Applicable fields: all kinds of three-dimensional or plane advertisements, wedding dresses, decorative paintings, children's paintings, etc.

8. Packing specification: width1.20m or1.22m, length100m, in drums.

Fourthly, the formed grating film must be accurately tested.

Because the grating plate made of grating film must be pressed by cold mounting machine during processing, it is very likely that the grating pitch of grating film will deviate from the original factory value. Therefore, the author suggests that the grating spacing must be measured accurately before using this grating plate.

At present, many users are using photoshop to test the grating, but the actual results show a large error, and various vertigo phenomena often appear in the stereoscopic effect. Whenever this happens, the user will push the "sin" to the grating material, which makes the grating material suffer a lot of grievances.

Last month, the author saw the above situation in a friend in Chengdu. Because there is no accurate measurement of grating spacing, the stereoscopic effect is always a little uncomfortable. Apart from blaming the "quality" of the grating film, my friend is at a loss.

I suggest this friend re-test the grating pitch with 3D MAGIC software. The same picture made with accurate grating spacing is refreshing and pleasing to the eye. Not only the stereoscopic effect has the usual illusion of "dazzling", but also the effect of changing pictures by adding stereoscopic grating is clear and distinguishable, which also exonerates the grating film.

The built-in grating test function of 3D MAGIC software is a sharp tool to test grating spacing quickly and accurately. In addition, 3D MAGIC software has various 3D/2D and combination design effects and flexible output modes, which is providing convenience for more and more stereo practitioners. You might as well try.

Five, how to protect the raster image

Grating images rely on grating refraction on their surfaces to achieve various stereoscopic/image-changing effects, and the grating materials are all plastic products. In this sense, the surface of the grating image needs to be protected, as do the grating plate and grating film.

There are many ways to protect the surface of raster image. One of the most common methods is to stick a layer of glass-backed organic board on the surface of the grating picture, which not only can avoid scratching the grating picture, but also increases the "deep" feeling of the grating picture, which makes the picture have a new artistic conception and improves the quality of the whole picture.

This method is not complicated and has low cost.

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The use of grating materials

In daily life, many people can take beautiful photos, but few really become professional graphic photographers.

To become a professional graphic photographer, you need to master professional photography theory, a lot of practical activities, and keen insight into shooting works. Therefore, graphic commercial photographers already belong to a full-time category.

For stereoscopic photography, not every professional photographer can complete stereoscopic photography works well. Stereo photographers must first be qualified graphic photographers, in addition, they must master the splitting of pictures, the foil relationship between objects with different depth of field, and the use of professional stereo photographic equipment.

Because stereo photography is very professional, stereo design software is a tool for professional stereo photographers to synthesize stereo photo. For most software users who are not professional photographers, instead of painstakingly converting plane photos into stereo photo, it is better to require professional stereo photographers to shoot faster and more realistically, but it is difficult to achieve the sense of reality that stereo photo has.

In addition, the stereoscopic pictures simulated by using software such as 3D MAX through modeling, texturing and rendering are still far from the real stereo photo in terms of realism and fineness. So at present, stereoscopic photography is irreplaceable by other methods.

Second, advertising and showing pictures are not equal to photos.

As we all know, photography advertising is a mature professional market, which is quite popular in daily life. However, we also see a large number of graphic design and production enterprises, advertising design enterprises, exhibition design and production enterprises. Although they do not have the qualifications of professional photographers, they still become the protagonists in today's advertising design and production market.

Patterns, colors and words constitute the three elements of advertising design. In a large number of print advertisements, it is necessary to obtain pictures through shooting technology, and shooting pictures occupy an important position in the current print advertisements. The exaggerated composition, exaggerated colors and accurate text description in print advertisements are difficult to achieve by photography technology, and designers need to use Photoshop, Illustrator and other software for creative design.

Similarly, stereoscopic photography plays an irreplaceable role in stereoscopic advertising pictures and stereoscopic display pictures, but stereoscopic advertising pictures and stereoscopic display pictures are not equal to stereoscopic photography works.

Compared with the flat screen, the three-dimensional advertising screen and the three-dimensional display screen give the screen a more novel and vivid form of expression. The goal they pursue is not only the realism of the picture, but more importantly, to make the propaganda theme give the observer a stronger impression, understand it faster and more accurately, and retain the memory for a longer time. The sense of "realism" pursued by simple stereoscopic photography works is quite different from the ultimate goal of stereoscopic advertising pictures and stereoscopic display pictures. Sometimes, the photographic works used in advertising pictures are not the theme of advertisements. At this time, it is even more important to put the cart before the horse by blindly emphasizing the three-dimensional sense and fidelity.

Three-dimensional design and production technology can bring brand-new picture expression and more exciting picture content to advertising and exhibition industry. At the same time, due to the characteristics of stereoscopic design technology, stereoscopic images are difficult to copy and imitate, which ensures the market value of creative design and brings considerable economic and social benefits to enterprises.

Understanding the advantages and disadvantages of stereo design software and stereo photography technology and making them complement each other will be beneficial to the promotion and development of stereo design technology in China and improve the overall level of design and production in China.