Division

The gradation curve is used to symbolically represent the contrast. A straight line corresponds to an even contrast, an S-shaped curve corresponds to a change in contrast.

Split is an outdated term for increasing the contrast of an image. A steeper gradation curve makes the lights brighter and the shadows blacker. The tonal range (difference between the lightest and darkest point) remains unaffected.

In the darkroom, the division could be achieved by copying on photographic material with greater contrast, but also by using hard-working developer fluid . In printing technology, the division was realized through the use of special printing films .

term

The name comes from the fact that the gradation makes the shape of a gradation curve steeper. This term was primarily used for photographic work in the darkroom or in printing technology during print preparation .

See also

• Line art
• Halftone image
• Density (photography)
• Document film
• histogram

Two versions of the image of a face: on the left with normal contrast, on the right with contrast heightening through division.