grayscale: Convert an RGB image to grayscale
In imager: Image Processing Library Based on 'CImg'

grayscale

R Documentation

Convert an RGB image to grayscale

Description

This function converts from RGB images to grayscale

Usage

grayscale(im, method = "Luma", drop = TRUE)

Arguments

`im`	an RGB image
`method`	either "Luma", in which case a linear approximation to luminance is used, or "XYZ", in which case the image is assumed to be in sRGB color space and CIE luminance is used.
`drop`	if TRUE returns an image with a single channel, otherwise keep the three channels (default TRUE)

Value

a grayscale image (spectrum == 1)

Examples


grayscale(boats) %>% plot
#In many pictures, the difference between Luma and XYZ conversion is subtle 
grayscale(boats,method="XYZ") %>% plot
grayscale(boats,method="XYZ",drop=FALSE) %>% dim

imager documentation built on May 31, 2023, 8:56 p.m.