imager (version 0.41.2)

grab: Select image regions interactively

Description

These functions let you select a shape in an image (a point, a line, or a rectangle) They either return the coordinates of the shape (default), or the contents. In case of lines contents are interpolated. Note that grabLine does not support the "pixset" return type.

Usage

grabLine(im, output = "coord")
grabRect(im, output = "coord")
grabPoint(im, output = "coord")

Arguments

im

an image

output

one of "im","pixset","coord","value". Default "coord"

Value

Depending on the value of the output parameter. Either a vector of coordinates (output = "coord"), an image (output = "im"), a pixset (output = "pixset"), or a vector of values (output = "value"). grabLine and grabPoint support the "value" output mode and not the "im" output.

See Also

display

Examples

# NOT RUN {
##Not run: interactive only 
##grabRect(boats)
##grabRect(boats,TRUE)
# }