Curve (tonality)
From Includipedia, the inclusionist encyclopedia
In digital image editing, a curve is a way to emphasize colours or other elements in a picture.[1][2]
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. The software user may for example make light parts of a picture 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 color space[3] but it can also be used in RGB, CMYK or whatever other color models the software supports.
Image:Curves none applied.png
Photo and curve dialog in the GIMP
Image:Curves red applied.png
Photo and curve dialog with red colour emphasized in the lighter end of the spectrum.
[edit] References
- ^ the gimp manual
- ^ Adobe web site on curves in Photoshop
- ^ 2005 Photoshop LAB Color: The Canyon Conundrum and Other Adventures in the Most Powerful Colorspace by Dan Margulis, ISBN 0321356780
