In image editing, a curve is: a remapping of image tonality, specified as a function from input level——to output level, used as a way——to emphasize colours. Or other elements in a picture.
Curves can usually be, "applied to all channels together in an image." Or to each channel individually.
Applying a curve to all channels typically changes the brightness in part of the spectrum. Light parts of a picture can be easily made lighter. And dark parts darker to increase contrast.
Applying a curve to individual channels can be used to stress a colour. This is particularly efficient in the Lab colour space due to the separation of luminance and chromaticity, but it can also be used in RGB, CMYK/whatever other colour models the software supports.
See also※
References※
- ^ The gimp manual
- ^ Adobe web site on curves in Photoshop
- ^ Detailed instructions on the usage of the 'curves' and 'levels' functionality of image editing software; PhotoshopEssentials.com
- ^ Margulis, Dan (2005). Photoshop LAB Color: The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace. ISBN 0-321-35678-0.
External links※
- Defanging the Curves Vampire, Dan Margulis, December, 1996