Prepress Image Formatting Terms (3)

4.23 halftone, screen tone

The tone of the picture represented by the dot size.

4.24 halftone positive picture

The shades of the positive image of the screen image are represented by dot size.

4.25 halftone negative halftone

Use the dot size to display the dark negative of the picture image.

4.26 color correction

In the color image copying, a dichroic patch correction process that restores the printed color closer to the original.

4.27 revision retouching

The process of trimming the color separation sheet to compensate for defects, improve tone reduction, and process the partial image.

4.28 masking masking

In photolithography, masks are used to correct the color and tone of a scene and to mask certain local processes.

4.29 mask mask

Photographic plates, used to correct the color, tone, or cover some of the local stencil, made of photographic film or opaque cut film.

4.30 Density (optical density)

The characteristic measure of the light absorbed by an object, that is, the ratio of the amount of incident light to the amount of reflected light or transmitted light, is represented by the decimal logarithm of the reciprocal of the transmittance or reflectance.

4.31 color density

The density of the color image, expressed as the decimal logarithm of the inverse of the transmittance or reflectance.

4.32 Contrast contrast

The difference in density between the brightest and darkest parts of the original and the copy.

4.33 Level gradation

The density level from the brightest to the darkest part of the image.

4.34 tone tone

Image information is restored in an optical representation of a uniform brightness area.

4.35 tone value

Measure of tone. In printing technology, the degree and density of transmission and reflection are usually used.

4.36 dot cover area

The sum of the pixel areas in a picture that is decomposed into pixels and non-pixels.

4.37 dot coverage coverage

The ratio of coverage area to total area is usually expressed as a percentage.

4.38 Under color removal (UCR)

In the four-color reproduction, when the three primary colors are used to restore gray and black, the proportion of the three primary colors is reduced, and the process of increasing the black ratio accordingly.

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