cielab_coldist: Generate a 'coldist' object for CIE Lab colors

In recolorize: Color-Based Image Segmentation

Generate a 'coldist' object for CIE Lab colors

Description

A stopgap function for generating a pavo::coldist object from CIE Lab colors. This a pretty serious abstraction of the original intention of a coldist object, which is to use a combination of spectra data, visual model, and/or receptor-noise model to calculate perceived chromatic and achromatic distances between colors. Because CIE Lab color space is an approximately perceptually uniform color space for human vision, we can calculate a version of those distances for a human viewer directly from CIE Lab. A decent option if you want preliminary results, if you only care about human perception, or if you don't have access to spectral data.

Usage

cielab_coldist(rgbcols)

Arguments

rgbcols

An nx3 matrix of RGB colors (rows are colors and columns are R, G, and B channels).

Details

I have mixed feelings about this function and would like to replace it with something a little less hand-wavey.

Value

A pavo::coldist object with four columns: the patches being contrasted (columns 1-2), the chromatic contrast (dS), and the achromatic contrast (dL), all in units of Euclidean distance in CIE Lab space.

recolorize documentation built on April 4, 2025, 3:07 a.m.