Logarithmic VS Digital Consecutive VS Halftone

With the advent of the digital Digiital era, the old logarithmic Analog technology was almost sealed up in the historical warehouse. What similarities and differences exist between digital and logarithmic? It is worthy of understanding.

Logarithmic VS digital

The natural world's disparities, strengths, weaknesses, contrasts, darkness, etc., have all existed in a smooth logarithmic manner. For example, if you go to climb a mountain and the slopes you walk on are gentle or steep, they are diagonally upwards. If there are stones that stand on the road, you have to pick up a certain point of force. This produces a certain height. There is a gap in the breath of the upper order.

Today, many mountaineering trails are provided with stone steps, cement steps or wooden ladders. This makes walking easier and more stable, and because there are ladders, regardless of the length of the legs of adults and kids, leg lengths and leg lengths lead to consistency. It is to replace the logarithm mechanism of the original free pace with the digital mechanism of the fixed step length and height.

It is an important trend in the trend of the times to change the signals of strength and strength in the natural world, such as sound, color, current, and current, into digital signals with order. This is easy to save, store, and copy. CD audio is based on digital presence. Although there are some gaps between live singing and performance, if you use logarithmic signal storage, the capacity will be several dozen times better. At the same time, the degree of copying distortion is even more serious. The digital information is easy to store and transmit. Copy, while the degree of distortion is minimal.

Continuous VS halftone

In the world of photography and in the painting world, there are continuous tones ranging from light to light and from light to dark. The levels move smoothly, and no traces of change can be seen. The only exceptions are the nineteenth-century dot paintings, using tiny dots. Piled up in shades and colors. After the invention of printing, the content of the text was first, and then everyone went to have a picture line pattern.

Relief, lithography, and screen are each a single shade of ink, and only the Milo version (gel on glass) and gravure can have different shades of ink in one print. In the fifteenth century, the gravure intaglio was made up of thin and dense lines and twists and turns into pictures and shades. Most of the characters and scenery on today’s banknotes were completed using this technique. It used the ink dot depth and the photogravure, which contained ink. The amount of difference in performance levels is quite different.

Flat printing plate shades, with a crayon light weight painting method, and later there is a convex soft-press color method, although the fixed point spacing, but due to the size of the pressure force, so that the dot network sparse changes, to show the screen shade level.

After the invention of photography, there were two levels of change: one was the photographic stencil of the manuscript, and the other was a photographic technique applied to the photographic platemaking project. In order to convert the continuous version of the photograph into dots with different densities as described above, Japan first used a bamboo sieve to screen and taste the miso sauce to form a screen, forming a net-measuring tool for the dot pitch, and later the glass net. The screens, contact screen screens, and electronic network point generators generate network points, so that the letterpress, lithography, and screen versions all display the shades of the screen in proportion to the dot area size. The technique of converting continuous-tone photographs into half-tone dot-printing plates is like converting logarithm data into digital information. Likewise, continuous-tone film is not easily copied, and half-tone meshes can be copied more freely and correctly.

Digital printing without print, including inkjet, photo paper, thermal sublimation, laser printing, electronic ink and thermal transfer methods, etc., many use halftone hard dot performance is very close to the print halftone dot, there are The use of many levels of ideas, 16 steps, 64 steps and 256 steps and other different ways of expression, like IRIS 300dpi before the performance of 256 steps, the screen effect is very detailed and beautiful, but 600dpi halftone hard point but rough feeling, non-1200dpi only It will be better (equivalent to the 150-line halftone mesh).

Therefore, it is very contradictory. In the case of color proofing, it must be hard-edged or even spotted to do half-tone proofing before it is closer to the printed matter. On the contrary, if there are tonal adjustments for each color point in pursuit of the photo effect, it may be a more important development direction for digital printing in the future.