Paleta

A gem for working with color palettes

Installation

To install, run

$ gem install paleta

Or, add this to your application's Gemfile

gem 'paleta'

and run

$ bundle

Usage

Color

Paleta allows users to create Color objects. Color objects can be defined by HSL, RGB or HEX values and can be manipulated and compared.

Creating Colors

Colors can be created using RGB or HSL components, or by using a HEX value by passing in a flag of the desired format as the first parameter. If no format flag is used, RGB is assumed.

color = Paleta::Color.new(:hsl, 280, 37, 68)
color = Paleta::Color.new(:rgb, 94, 161, 235)
color = Paleta::Color.new(:hex, "5EA1EB")

# creating a Color with no flag defaults to RGB components

color = Paleta::Color.new(94, 161, 235)

Individual component values can be accessed by name

color.red # => 94
color.green # => 161
color.blue # => 235
color.hue # => 211.48936170212767
color.saturation # => 77.90055248618782
color.lightness # => 64.50980392156862
color.hex # => "5EA1EB"

Get an array representation of a Color

c = Paleta::Color.new(30, 90, 120)
c.to_array(:rgb) # => [30, 90, 120]

Manipulating Colors

Colors can be lightened or darkened by a percentage

color.lighten!(10) 
color.darken!(30) 

Colors can be desaturated

color.desaturate!

Colors can be turned into their complement Colors

color.complement!

Colors can be inverted

color.invert!

Note all of the previous methods directly manipulate the object on which they were called. If you would like to create a new Color object that is a copy of the original color (but with the desired manipulation), call the desired method without the trailing bang !.

For example, lets create a new Color that is the complement of a Color we have already defined.

new_color = color.complement

Comparing Colors

Colors can calculate their similarity to other Colors. The similarity method returns a value between 0 and 1, with 0 being identical and 1 being as dissimilar as possible.

color = Paleta::Color.new(:hsl, 280, 37, 68)
color2 = Paleta::Color.new(237, 172, 33)
color.similarity(color2) # => 0.4100287904421024

Palette

Palettes are collections of Colors, they share many common Array methods such as push, pop, sort, include? and each. Palettes also allow collections of Colors to be manipulated as a whole and to be compared to each other.

Creating a Palette

Palettes can be created by passing a list of Colors to the Palette constructor, or on the fly with push and <<.

color1 = Paleta::Color.new(13, 57, 182)
color2 = Paleta::Color.new(94, 161, 235)
color3 = Paleta::Color.new(237, 182, 17)
palette = Paleta::Palette.new(color1, color2)

palette << color3

Retrieving and Removing Colors from Palettes

Colors can be accessed and removed by index.

palette[1] # => color2

palette.delete_at(2)

Get an array representation of a Palette

c1 = Paleta::Color.new(13, 57, 182)
c2 = Paleta::Color.new(94, 161, 235)
palette = Paleta::Palette.new(c1, c2)
	
palette.to_array(:rgb) # => [[13, 57, 182], [94, 161, 235]]

Manipulating Palettes

Palettes can be lightened, darkened or inverted as a whole.

palette.lighten!(15)
palette.darken!(20)
palette.invert!

Comparing Palettes

Palettes can calculate their similarity to other Palettes by using the similarity method. Just as with Color#similarity, this method returns a value between 0 and 1, with 0 being identical and 1 being as dissimilar as possible.

color1 = Paleta::Color.new(13, 57, 182)
color2 = Paleta::Color.new(237, 172, 33)
palette1 = Paleta::Palette.new(color1, color2)

color3 = Paleta::Color.new(13, 57, 182)
color4 = Paleta::Color.new(94, 161, 235)
palette2 = Paleta::Palette.new(color3, color4)

palette1.similarity(palette2) # => 0.0046992695975874915

Generating Palettes

Palettes can be generated from a "seed" Color or from an image by using the generate method.

Generate a Palette of shades from a Color

color = Paleta::Color.new(:hex, "ff0000")
palette = Paleta::Palette.generate(:type => :shades, :from => :color, :size => 5)

Generate a Palette of analogous Colors from a Color

color = Paleta::Color.new(:hex, "0066cc")
palette = Paleta::Palette.generate(:type => :analogous, :from => :color, :size => 5)

Generate a Palette of monochromatic Colors from a Color

color = Paleta::Color.new(:hex, "336699")
palette = Paleta::Palette.generate(:type => :monochromatic, :from => :color, :size => 5)

Generate a Palette of complementary Colors from a Color

color = Paleta::Color.new(:hex, "0000ff")
palette = Paleta::Palette.generate(:type => :complementary, :from => :color, :size => 5)

Generate a Palette of split-complement Colors from a Color

color = Paleta::Color.new(:hex, "006699")
palette = Paleta::Palette.generate(:type => :split_complement, :from => :color, :size => 5)

Generate a Palette of triad Colors from a Color

color = Paleta::Color.new(:hex, "006699")
palette = Paleta::Palette.generate(:type => :triad, :from => :color, :size => 5)

Generate a Palette of tetrad Colors from a Color

color = Paleta::Color.new(:hex, "dd5533")
palette = Paleta::Palette.generate(:type => :tetrad, :from => :color, :size => 5)

Generate a random Palette

palette = Paleta::Palette.generate(:type => :random, :size => 5)

Palettes can also be generated from a seed image

Generate a Palette from an image

palette = Paleta::Palette.generate(:from => :image, :image => "/path/to/image.jpg", :size => 5)

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See the documentation.