R: Color and image color mode conversions

channel {EBImage}

R Documentation

Color and image color mode conversions

Description

channel handles color space conversions between image modes. rgbImage combines Grayscale images into a Color one.

Usage

 
  channel(x, mode)
  rgbImage(red, green, blue)

Arguments

`x`	An `Image` object or an array.
`mode`	A character value specifying the target mode for conversion. See Details.
`red, green, blue`	`Image` objects in `Grayscale` color mode or arrays of the same dimension. If missing, a black image will be used.

Details

Conversion modes:

rgb: Converts a Grayscale image or an array into a Color image, replicating RGB channels.
gray, grey: Converts a Color image into a Grayscale image, using uniform 1/3 RGB weights.
red, green, blue: Extracts the red, green or blue channel from a Color image. Returns a Grayscale image.
asred, asgreen, asblue: Converts a Grayscale image or an array into a Color image of the specified hue.

channel changes the pixel intensities, unlike colorMode which just changes the way that EBImage should render an image,

Value

An Image object or an array.

Author(s)

Oleg Sklyar, osklyar@ebi.ac.uk

Examples

 x = readImage(system.file("images", "shapes.png", package="EBImage"))
 if (interactive()) display(x)
 y = channel(x, 'asgreen')
 if (interactive()) display(y)

 ## rgbImage
 x = readImage(system.file('images', 'nuclei.tif', package='EBImage'))
 y = readImage(system.file('images', 'cells.tif', package='EBImage'))
 if (interactive()) display(x, title='Cell nuclei')
 if (interactive()) display(y, title='Cell bodies')

 cells = rgbImage(green=1.5*y, blue=x)
 if (interactive()) display(cells, title='Cells')

[Package EBImage version 3.10.0 Index]