What is the term color change in printing, and what do the professional terms in printing continuous

Are you misremembering? You don't have that term for typography.

Composition of variations of the three primary colors.

A continuous tone image usually refers to the change of tone from light to dark or from dark to light on an image, and the intensity or shade is composed of the density of particles per unit area of the imaged substance. For example, the continuous tone of the photographic color separation negative is composed of the density of metallic silver particles per unit area; The continuous tone of various color drawings is composed of the density of various pigment particles in the unit area, and the pigment particles in the unit area are mostly dark tones, otherwise they are light tones. The variation in the depth of the continuous tone image is infinite.

Halftones usually refer to the change from light to dark or from light to dark on the printed matter after special processing, which is expressed by the size of the dot area. On the printed screen, colors and shades are represented by dots. When observing the printed picture, the dot area is large, and the color is dark, which is called deep tone; If the dot area is small and the color is light, it is called high-key.

Because the dots have a certain distance in space, they are discrete distribution, and because there is always a certain limitation on the number of stages of the network, the stepless change cannot be realized in the hierarchical change of the image like the continuous tone image, so the screen image is called a halftone image. Male films, negative films, printed images, and so on are all halftone images.

Continuous: There are continuous shades from highlights to dark tones. Midtones:

Highlights are in the range of tones between high and dark tones (4 to 6 dots). Continuous-tone image: A tonal change from light to dark or dark to light on an image.

And the shade or shade is composed of the particle density of the imaged material per unit area. Halftone: refers to the change from light to dark or from light to dense on the printed matter after special processing, which is expressed by the size of the dot area.

And what you mean by color is the gradient in the design.

It's not that profound, it's very simple.

Hope it helps.

Spot color refers to the printing of colors with a specific ink.

Spot color inks are pre-mixed by printing plants or produced by ink factories. For each spot color of the printed matter, there is a special color plate corresponding to the dust during printing. Use spot colors to make colors more accurate.

Although it is not possible to accurately represent the color on the computer, the pre-printed color swatch card of the standard color matching system can see the accurate color of the color on the paper, such as the Pantone color matching system, which creates a very detailed color swatch card.

For the non-standard spot color set in the design, the printer may not be able to mix it accurately, and the accurate color cannot be seen on the screen, so if it is not a special need, do not easily use the spot color defined by yourself.