rgb_to_lab: Convert from RGB colour channels to Lab space.

In schemr: Convert Images to Usable Color Schemes

Convert from RGB colour channels to Lab space.

Description

Convert from RGB colour channels to Lab space.

Usage

rgb_to_lab(rgb, transformation = "sRGB", linear_func = NULL)

Arguments

rgb	A dataframe or matrix with red, green and blue colour channels located in the columns 1 to 3, respectively. Colour channel values should be between 0 and 255, inclusive.
transformation	An option in c("sRGB", "Adobe") for a built-in transformation or, alternatively, a custom 3x3 transformation matrix.
linear_func	A function to convert RGB colour space into linear RGB space. Used only if a custom transformation matrix is provided. Transformation skips if no function is provided under a user-defined transformation matrix. See: https://en.wikipedia.org/wiki/SRGB.

Value

A tibble of L, a and b colour space values.

Examples

red <- sample(x = 1:255, size = 10, replace = TRUE)
green <- sample(x = 1:255, size = 10, replace = TRUE)
blue <- sample(x = 1:255, size = 10, replace = TRUE)
rgb_to_lab(data.frame(r = red, g = green, b = blue), transformation = "Adobe")

schemr documentation built on June 25, 2024, 9:07 a.m.