utils_colorspace {pliman}

Convert between colour spaces

Description

rgb_to_srgb() Transforms colors from RGB space (red/green/blue) to Standard Red Green Blue (sRGB), using a gamma correction of 2.2.

• rgb_to_hsb() Transforms colors from RGB space (red/green/blue) to HSB space (hue/saturation/brightness).

• rgb_to_lab() Transforms colors from RGB space (red/green/blue) to CIE-LAB space

It is assumed that

Usage

rgb_to_hsb(object)

rgb_to_srgb(object)

rgb_to_lab(object)

Arguments

object

An Image object, an object computed with analyze_objects() with a valid object_index argument, or a data.frame/matrix. For the last, a three-column data (R, G, and B, respectively) is required.

Value

A data frame with the columns of the converted color space

Author(s)

Tiago Olivoto [e-mail]

Examples

if(interactive()){
library(pliman)
img <- image_pliman("sev_leaf.jpg")
rgb_to_lab(img)

# analyze the object and convert the pixels
anal <- analyze_objects(img, object_index = "B", pixel_level_index = TRUE)
rgb_to_lab(anal)
}