persp.im

Perspective Plot of Pixel Image

Displays a perspective plot of a pixel image.

Usage

## S3 method for class 'im':
persp(x, \dots, colmap=NULL)

Details

This is the persp method for the class "im".

The pixel image x must have real or integer values. These values are treated as heights of a surface, and the surface is displayed as a perspective plot on the current plot device, using equal scales on the x and y axes.

The optional argument colmap gives an easy way to display different altitudes in different colours (if this is what you want).

• Ifcolmapis a colour map (object of class"colourmap", created by the functioncolourmap) then this colour map will be used to associate altitudes with colours.
• Ifcolmapis a character vector, then the range of altitudes in the perspective plot will be divided intolength(colmap)intervals, and those parts of the surface which lie in a particular altitude range will be assigned the corresponding colour fromcolmap.
• Ifcolmapis a list with entriesbreaksandcol, thencolmap$breaksdetermines the breakpoints of the altitude intervals, andcolmap$colprovides the corresponding colours.

See Also

im.object, plot.im, contour.im

Aliases

• persp.im

Examples

# an image
   Z <- setcov(owin())
   persp(Z, colmap=terrain.colors(128))
   co <- colourmap(range=c(0,1), col=rainbow(128))
   persp(Z, colmap=co, axes=FALSE, shade=0.3)