Logarithmic VS digits continuous tone VS halftone
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With the advent of the digital Digiital era, the old logarithmic Analog technology is almost sealed to the historical warehouse. What are the similarities and differences between digital and logarithmic? It is a problem worth knowing.
Logarithmic VS digit
The differences, strengths, contrasts, and faintness of nature have always existed in a logarithmic logarithm. For example, if you go climbing a mountain, the slopes that are going, whether slow or steep, are slanted upwards. If a stone is on the road, you must hit a certain level of force, which will produce a certain height. The upper level difference exists in one breath.
Today, many mountaineering roads are equipped with stone steps, cement steps or wooden ladders, which makes the walks smoother and more stable. Because of the ladder, no matter how big the adults and children are, the legs are short and the legs are short. It is to replace the logarithmic mechanism of the original free-small step with the digital mechanism of the fixed step length and height.
It is an important trend of the times to change the continuous strong and weak signals of sound, color, power, current and other natural continuous strong and weak signals into order digital signals, which are easy to smash, store and copy. CD audio is digital, although there are some gaps with live singing and playing, but if you use logarithmic signal storage, the capacity will be several times higher, and the degree of copying distortion is more serious. Digital information is easy to store and transmit. Copying, while the degree of distortion is minimal.
Continuously tuning VS halftone
In the world of photography and in the world of painting, there are continuous adjustments from dark to light, from light to thick, and the layers move smoothly. There is no trace of change. The only exception is the dot painting in the 19th century, using tiny dots. Stacked into a picture of shades and colors. After the invention of the printing, the content of the text is followed, and then everyone goes to the line drawing pattern.
Each color print of the letterpress, lithographic, and screen prints is a single shade of ink, and only the Jurassic version (the gel on the glass) and the gravure can have different shades of ink in one print. In the fifteenth century, the engraving gravure uses the thickness of the lines and the twists and turns, and combines them into a picture and a shade. The characters and scenery on the banknotes today are mostly done by this technique, and the gravure is not used in the depth of the ink mark. The amount varies to show the level of shading, which is quite different.
The shade of the plate-printing plate is coated with a crayon light and heavy pen. Later, there is a soft-pressed color method of the bump. Although the dot pitch is fixed, the thickness of the pressurization force causes the dot to become rich and change, to express the shade. level.
After the invention of photography, two levels of change occurred: one was the photographic of the original, and the other was the application of photography techniques in photoengraving. In order to change the continuous version of the photo into different dense dots of the color-opening method as mentioned above, Japan first used the bamboo sieve of the sieve-flavored miso paste to make the screen, forming the network tool of the dot spacing, and later the glass mesh. The eye screen, the contact net screen, and the electronic dot generator generate the dots, so that the letterpress, the lithographic plate and the screen plate are presented in a proportion of the area of the dot size. This technique of converting a continuously tuned photo into a halftone dot print version converts the logarithmic data into digital information. Similarly, the continuous tone film is not easy to copy, and the halftone mesh can be copied freely and correctly.
Digital printing, including inkjet, photographic paper, sublimation, laser printing, electronic ink printing and thermal transfer, etc. Many of the halftone dots using halftone hard dot method are very close to the halftone dots of printed matter. The use of many levels of ideas, 16th, 64th and 256th order and other different expressions, like IRIS before 300dpi has 256 steps, the picture is very detailed and beautiful, but the 600dpi halftone hard point has a rough feeling, not 1200dpi It will be better (compared to the 150-line halftone network).
Therefore, it is very contradictory now. In color proofing, it is necessary to make hard spots or even draw halftone proofs to be closer to printed matter. Conversely, in pursuit of photo effects, each color point has a tone, which may be a more important development direction for digital printing in the future.