R: Enhancing images and colors

enhance {EBImage}

R Documentation

Enhancing images and colors

Description

Functions to enhance and modify colors in images.

Usage


  ## S4 method for signature 'Image':
  cgamma(x, level=1, ...)
  ## S4 method for signature 'Image':
  contrast(x, sharpen=TRUE, ...)
  ## S4 method for signature 'Image':
  enhance(x, ...)
  ## S4 method for signature 'Image':
  equalize(x, ...)
  ## S4 method for signature 'Image':
  modulate(x, value=100, ...)

Arguments

`x`	An object of `Image`.
`level`	A numeric for the gamma level.
`sharpen`	A logical specifying whether the contrast should be increased (`TRUE`) or decreased (`FALSE`).
`value`	A percent change in brightness, saturation, and hue. The default value to keep the values unchanged.
`...`	Reserved.

Details

cgamma gamma-corrects image. The same image viewed on different devices will have perceptual differences in the way the image's intensities are represented on the screen. Adjust all three channels with the level parameter. Values typically range from 0.8 to 2.3.

contrast enhances the intensity differences between the lighter and darker elements of the image.

enhance applies a digital filter that improves the quality of a noisy image.

equalize applies a histogram equalization to the image.

modulate lets you control the brightness, saturation, and hue of an image. Modulate represents the brightness, saturation, and hue as one parameter.

Value

A transformed image in an object of Image.

Author(s)

Oleg Sklyar, osklyar@ebi.ac.uk, 2006-2007

References

ImageMagick: http://www.imagemagick.org.