blend_colors-methods: blend two color planes

In bbuchsbaum/colorplane: Basic S4 Classes and Methods for Mapping Between Numeric Values and Colors

blend two color planes

Description

given two color planes, generate a new color plane by blending the colors using the supplied alpha multiplier.

Usage

blend_colors(bottom, top, alpha)

## S4 method for signature 'ColorPlane,ColorPlane,numeric'
blend_colors(bottom, top, alpha = 1)

## S4 method for signature 'ColorPlane,ColorPlane,missing'
blend_colors(bottom, top)

## S4 method for signature 'HexColorPlane,RGBColorPlane,numeric'
blend_colors(bottom, top, alpha)

## S4 method for signature 'HexColorPlane,ConstantColorPlane,numeric'
blend_colors(bottom, top, alpha = 1)

Arguments

bottom	the bottom color plane
top	the top color plane
alpha	the alpha overlay value.

Details

The functions in this package blend colors based on the "over" operator where 'top' if foreground and 'bottom' is background.

Value

a new ColorPlane instance with 'top' and 'bottom' alpha-blended.

References

https://en.wikipedia.org/wiki/Alpha_compositing

Examples

top <- IntensityColorPlane(1:5, cols=rainbow(5))
bottom <- IntensityColorPlane(1:5, cols=rev(rainbow(5)))

top <- map_colors(top)
bottom <- map_colors(bottom)
bc <- blend_colors(bottom, top, .5)

bbuchsbaum/colorplane documentation built on March 12, 2023, 8:11 a.m.