What Are Digital Photo Cards?

Digital photos are a perfect combination of digital technology and photographic photography. The so-called digital representation is usually used in computer science and electronics , especially real-world information is converted into binary digital forms, such as digital audio and digital photos. The signal carrying the data is an electronic or optical pulse , with each amplitude representing a logic 1 (pulsed and / or high) or a logic 0 (no pulse and / or low).

Digital photos ^[1]

advantage

1. Convenient processing of color, brightness, sharpness, and even special effects on photos.

2. Convenient for copying, transmitting, and sharing. The sharing range and crowd are larger than traditional negatives.

3. The pixel size of the photo can be set according to actual needs.

Disadvantage

1. High requirements for camera quality, high pixel footprint.

2. The magnification is not as good as traditional negatives.

3. The life of the storage medium is unstable. For example, the life of the U disk is limited, so the storage risk is large.

4, easy to be copied, poor concealment.

Shadow magic hands

Digital printing is that the index code image is exposed on the silver salt color photosensitive material through the exposure engine and then processed through chemical processing to form a photo. Printing photos refers to the use of inkjet printers to print pigments on photographic paper to form photos. From the principle of the two, there is a big difference. Printing photos is a process of chemical reaction, while printing photos is a process of physical reaction. There is an essential difference between the two. Here is their comparison:

1.Output quality

Professional digital printing mainly uses Kodak or Fuji's large-scale laser printing equipment. The photos printed by these large equipment are quite satisfactory in terms of color, sharpness, and layering. Photo printing technology has been continuously developed and improved, and now the printing effect is similar to that of large-scale laser printing. Especially for some professional photo printers, ordinary people must carefully discern the differences between them. In summary: the effect of laser digital printing is slightly better than that of photo printers, but most people can hardly distinguish between printing and high-quality printing.

2. Photo saving < br The final imaging material and principle of photo printing are similar to the original film printing, so the photo storage time is similar. Depending on the photo paper and potion provided by the printer, some claim to have been stored for 60 years or more than 100 years. Waterproof to a certain extent, of course, it is best to pay attention to moisture resistance in plastic packaging or cold mounting or storage. Photo printing is easy to fade. This is a problem that is well-known in the past. Especially when you don't buy the authentic inks of a few hundred yuan a box, it is common to find that it is faded within a few months. But now a certain print also promotes that the photo will not fade for 60 to 70 years. Photos are printed with water-resistant ink, which is water-resistant. Of course, the above situations must be avoided under strong light, ultraviolet rays, and humid environments. In summary: photo development and high-quality printing can be stored for a long time under certain storage conditions.

3. Different materials < br The photo paper materials of the two are different. The surface of the printed photo paper is coated with three kinds of red, green, and blue photosensitive dyes. After exposure, a latent image is formed, and then developed and bleached. Set, stabilize and bake, and finally form a stable image. Printed photo paper is generally white. There are many options for printing photos. It can be general photo paper, metal paper such as gold foil paper, silver foil paper, etc. It can also be printed on thick cloth and other materials.

4. Format <br /> The size of print photos is usually about 5 inches to 48 inches, and the maximum width of photo paper is about 50 inches, and the longest is 2 meters. The printing range is larger, the widest is 2-3 meters, and the length can be unlimited.

5. Imaging accuracy < br The resolution of digital print photos is about 200 ~ 600dpi. The resolution of 5-6 inch photos such as laser print is 300dpi ~ 400dpi, and the 24-48 inch large format is 250 ~ 300dpi. The photos are delicate. The printer's resolution is nominally 1200dpi, or even more than 2800 ~ 5000dpi, but the printer's resolution is calculated based on the number of ink dots per inch, and the print resolution is calculated based on the pixels per inch. The more colors of the printer's ink cartridges, the higher the nominal resolution. The theoretical resolution should be about 300 dpi, but due to the penetration of ink dots and errors in printing and paper feeding, the actual resolution is about 250 dpi.

6, color reproduction < br It should be said that both print and print can output colorful, saturated, and excellent digital photos, but because the printer's original ink cartridges are expensive, most businesses use replacement ink cartridges, which are in the dynamic range. The performance of the color gamut space is definitely inferior, but the average person does not see it.

7. Output cost < br Digital printing now prints a 5-inch photo, using very good equipment and consumables, the price can now reach 0.70 yuan / sheet. Considering the basic situation, a family rushes 400 photos a year and costs only 280 yuan. But there are some physical or time costs involved, as it involves issues of sending, taking, or waiting. Photo printers are eye-catching at around 1,000 yuan. I need to consume ink and photo paper for each print. I wo nt list the specific accounts. The end result is that, except for the printer, the cost of each 5-inch photo is 2- 3 yuan. Think of a family output of 400 sheets a year, so the cost of consumables is about 1,000 yuan. Summary: Photo printing is cheaper than it is.

8. Equipment efficiency < br Digital printing equipment is commercial equipment suitable for mass production. In addition, there are professional printing technicians to operate and maintain. The quality of the photos printed in each batch is very stable. Although photo printing can be used at home, if the print volume is particularly large, the print speed should be considered. From a security perspective, photo printing is more secure and reliable. But unless you have special needs, in general, for the sake of meaninglessness and a low probability of privacy and security issues, it is not worth the loss of photo printing.