react-native-image-colors

Fetch prominent colors from an image.

This module is a wrapper around the Palette class on Android, UIImageColors on iOS and node-vibrant for the web.

Installation

• Expo
• React Native CLI
• Web

Expo

Requirements

• Expo SDK 47+

yarn add react-native-image-colors

npx expo prebuild

iOS

npx expo run:ios

Android

npx expo run:android

The example is an expo app.

React Native CLI

Requirements

• React Native v0.70.0+
• iOS 13.4+
• Expo modules must be configured

Users on < RN0.69 and older can use v1.x.x

yarn add react-native-image-colors

iOS

npx pod-install

npx react-native run-ios

Android

npx react-native run-android

Web

yarn add react-native-image-colors

Usage

import React from 'react'
import { getColors } from 'react-native-image-colors'

const useImageColors = () => {
  const [colors, setColors] = React.useState(null)

  React.useEffect(() => {
    const url = 'https://i.imgur.com/68jyjZT.jpg'

    getColors(url, {
      fallback: '#228B22',
      cache: true,
      key: url,
    }).then(setColors)
  }, [])

  return colors
}

API

ImageColors.getColors(uri: string, config?: Config): Promise<ImageColorsResult>

uri

A string which can be:

• URL:

  https://i.imgur.com/O3XSdU7.jpg

• Local file:

  const catImg = require('./images/cat.jpg')

• Base64:

  const catImgBase64 = 'data:image/jpeg;base64,/9j/4Ri...'

  The mime type prefix for base64 is required (e.g. data:image/png;base64).

Config?

The config object is optional.

Property	Description	Type	Default	Supported platforms
fallback	If a color property couldn't be retrieved, it will default to this hex color string	string	"#000000"	All
cache	Enables in-memory caching of the result - skip downloading the same image next time.	boolean	false	All
key	Unique key to use for the cache entry. The image URI is used as the unique key by default. You should explicitly pass a key if you enable caching and you're using a base64 string as the URI.	string	undefined	All
headers	HTTP headers to be sent along with the GET request to download the image	Record<string, string>	undefined	iOS, Android
pixelSpacing	How many pixels to skip when iterating over image pixels. Higher means better performance (note: value cannot be lower than 1).	number	5	Android
quality	Highest implies no downscaling and very good colors.	'lowest' 'low' 'high' 'highest'	"low"	iOS, Web

ImageColorsResult

Every result object contains a respective platform key to help narrow down the type.

AndroidImageColors

Property	Type
dominant	string
average	string
vibrant	string
darkVibrant	string
lightVibrant	string
darkMuted	string
lightMuted	string
muted	string
platform	"android"

WebImageColors

Property	Type
dominant	string
vibrant	string
darkVibrant	string
lightVibrant	string
darkMuted	string
lightMuted	string
muted	string
platform	"web"

IOSImageColors

Property	Type
background	string
primary	string
secondary	string
detail	string
platform	"ios"

---

Notes

• There is an example app.
• Since the implementation of each platform is different you can get different color results for each.