extract-colors

Extract Colors

Extract color palettes from images.
Simple use, < 5ko minified, fast process and no dependencies for browser.
Dependency to canvas for node.js

Try the demo

Requirements

Browsers

• Firefox: 29+
• Chrome: 33+
• Edge: 12+
• Opera: 19+
• Safari: 8+
• Webview Android: 4.4.3+
• Samsung Internet: 2.0+
• Internet Explorer

Node

• Node.js: 0.12+

Install

For browser

npm install --save extract-colors

For node.js

Need to install dependency canvas

npm install --save extract-colors canvas

Usage

Browser example

import extractColors from 'extract-colors'

const src = 'my-image.jpg'

extractColors(src)
  .then(console.log)
  .catch(console.error)

You can use different types for src param (String for a path of image, Image or ImageData).
If you use ImageData type, be carrefull because the extractor will not optimize the process (it will not reduce the count of pixels).

Node.js example

const path = require('path')
const { extractColors } = require('extract-colors')

const src = path.join(__dirname, './my-image.jpg')

extractColors(src)
  .then(console.log)
  .catch(console.log)

You can use different types for src param (String for a path of image or ImageData).
If you use ImageData type, be carrefull because the extractor will not optimize the process (it will not reduce the count of pixels).

Options

const src = 'my-image.jpg'

const options = {
  pixels: 10000,
  distance: 0.2,
  saturationImportance: 0.2,
  splitPower: 10,
  colorValidator: (red, green, blue, alpha = 255) => alpha > 250
}

extractColors(src, options)
  .then(console.log)
  .catch(console.error)

pixels
Total pixel number of the resized picture for calculation
Type: Integer
Default: 10000

distance
From 0 to 1 is the color distance to not have near colors (1 distance is between white and black)
Type: Number
Default: 0.2

saturationImportance
Power of the saturation weight during the process (0 is not used, 1 is only saturation and not area size)
Type: Number
Default: 0.2

splitPower
Approximation power in the first color splitting during process (from 2 to 16)
Type: Integer
Default: 10

colorValidator
Test function to enable only some colors
Type: Function
Default: (red, green, blue, alpha = 255) => alpha > 250

crossOrigin
Only for browser, can be 'Anonymous' to avoid client side CORS (the server side images need authorizations too)
Type: String
Default: null

Return of the promise

Array of colors with the followed properties:

[
  {
    hex: '#62342b',
    red: 98,
    green: 52,
    blue: 43,
    area: 0.5915,
    saturation: 0.2156862
  },
  ...
]

Field	Example	Type	Description
hex	#62342b	String	color in hexadecimal string
red	98	Integer	red canal from 0 to 255
green	52	Integer	green canal from 0 to 255
blue	43	Integer	blue canal from 0 to 255
area	0.5915	Number	area of the color and his neighbouring colors from 0 to 1
saturation	0.2156862	Number	color saturation from 0 to 1

API doc

Read the API doc here

License

Copyright (C) 2019 Damien Doussaud

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.