Map a Greyscale Image to Color
Maps a greyscale image to color using a color palette.
colormap(x, palette = heat.colors(256L))
x |
an |
palette |
character vector containing the color palette |
The colormap function first linearly maps the pixel intensity values
of x to the integer range 1:length(palette). It then
uses these values as indices to the provided color palette to create
a color version of the original image.
The default palette contains 256 colors, which is the typical number of different shades in a 8bit grayscale image.
An Image object of color mode Color, containing the color-mapped version
of x.
Andrzej Oleś, andrzej.oles@embl.de, 2016
x = readImage(system.file("images", "sample.png", package="EBImage"))
## posterize an image using the topo.colors palette
y = colormap(x, topo.colors(8))
display(y, method="raster")
## mimic MatLab's 'jet.colors' colormap
jet.colors = colorRampPalette(c("#00007F", "blue", "#007FFF", "cyan", "#7FFF7F", "yellow", "#FF7F00", "red", "#7F0000"))
y = colormap(x, jet.colors(256))
display(y, method="raster")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.