Calculate Luminosity/Brightness of an Image — img

Extracts luminance information from a specified colorspace and returns the appropriate channel.

Usage

img_luminosity(image, method = "grayscale", file = NULL, overwrite = FALSE)

image: character or magick-image. Image to extract information from.
method: character. The method used to calculate luminosity/brightness. Options are "greyscale" or "grayscale" to get a greyscale version of an RGB image, "LAB" to extract the lightness (L) channel from a LAB colorspace, "HSV" to extract the value (V) channel from a HVS colorspace, "YCbCr" for the luminance channel (Y) from a YCbCr color space, or "YIQ" for the luma (Y) channel in YIQ colorspace. YCbCr and YIQ produce the same luminosity values, despite being different colorspaces.
file: character. File path to the output image.
overwrite: logical. If overwriting files is allowed.

a magick image.