react-native-color-matrix-image-filters

Various color matrix based image filters for iOS & Android.

Status

• iOS & Android:
  • filter components work as wrappers for Image, ImageBackground, react-native-fast-image and expo-image components
  • doesn't support gif format on iOS
• react-native:
  • supported versions: ">=0.60.0"
  • supports both "old" and "new" architecture

Getting started

1. Install latest version from npm

npm i react-native-color-matrix-image-filters

2. Install pods

if using "old" architecture:

npx pod-install

if using "new" architecture:

RCT_NEW_ARCH_ENABLED=1 npx pod-install

Scope

This module is meant to be used for simple stuff, like "grayscaling inactive user avatar" etc. Check react-native-image-filter-kit if you need some advanced features like image blending/composing, extracting filtering results to file system and ability to create custom filters.

Example

import { Image } from 'react-native'
import {
  Grayscale,
  Sepia,
  Tint,
  ColorMatrix,
  concatColorMatrices,
  invert,
  contrast,
  saturate
} from 'react-native-color-matrix-image-filters'

const GrayscaledImage = (imageProps) => (
  <Grayscale>
    <Image {...imageProps} />
  </Grayscale>
)

const CombinedFiltersImage = (imageProps) => (
  <ColorMatrix matrix={concatColorMatrices(sepia(), tint(1.25))}>
    <Image {...imageProps} />
  </ColorMatrix>
)

const ColorMatrixImage = (imageProps) => (
  <ColorMatrix matrix={concatColorMatrices(saturate(-0.9), contrast(5.2), invert())}>
    <Image {...imageProps} />
  </ColorMatrix>
)

| Original | Grayscaled | | :----------------------------------------------------------------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------------------------------------------: | | | |

| CombinedFilters | ColorMatrix | | :------------------------------------------------------------------------------------------------------------------------------------: | :-----------------------------------------------------------------------------------------------------------------------------------------: | | | |

Usage

Each filter support all of View props. Also some filters have optional amount prop which takes a number. ColorMatrix filter has matrix prop which takes a Matrix - an array of 20 numbers. Additionally library exports functions like grayscale, tint etc. - these functions return values of Matrix type and their results can be combined with concatColorMatrices function.

Reference

Supported filters

| Component | Additional props | function | | ---------------- | --------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | | ColorMatrix | matrix: Matrix | - | | Normal | - | normal(): Matrix | | RGBA | red: number = 1, green: number = 1, blue: number = 1, alpha: number = 1 | rgba(red: number = 1, green: number = 1, blue: number = 1, alpha: number = 1): Matrix | | Saturate | amount: number = 1 | saturate(amount: number = 1): Matrix | | HueRotate | amount: number = 0 | hueRotate(amount: number = 0): Matrix | | LuminanceToAlpha | - | luminanceToAlpha(): Matrix | | Invert | - | invert(): Matrix | | Grayscale | amount: number = 1 | grayscale(amount: number = 1): Matrix | | Sepia | amount: number = 1 | sepia(amount: number = 1): Matrix | | Nightvision | - | nightvision(): Matrix | | Warm | - | warm(): Matrix | | Cool | - | cool(): Matrix | | Brightness | amount: number = 1 | brightness(amount: number = 1): Matrix | | Contrast | amount: number = 1 | contrast(amount: number = 1): Matrix | | Temperature | amount: number = 1 | temperature(amount: number = 1): Matrix | | Tint | amount: number = 0 | tint(amount: number = 0): Matrix | | Threshold | amount: number = 0 | threshold(amount: number = 0): Matrix | | Technicolor | - | technicolor(): Matrix | | Polaroid | - | polaroid(): Matrix | | ToBGR | - | toBGR(): Matrix | | Kodachrome | - | kodachrome(): Matrix | | Browni | - | browni(): Matrix | | Vintage | - | vintage(): Matrix | | Night | amount: number = 0.1 | night(amount: number = 0.1): Matrix | | Predator | amount: number = 1 | predator(amount: number = 1): Matrix | | Lsd | - | lsd(): Matrix | | ColorTone | desaturation: number = 0.2, toned: number = 0.15, lightColor: string = "#FFE580", darkColor: string = "#338000" | colorTone(desaturation: number = 0.2, toned: number = 0.15, lightColor: string = "#FFE580", darkColor: string = "#338000"): Matrix | | DuoTone | firstColor: string = "#FFE580", secondColor: string = "#338000" | duoTone(firstColor: string = "#FFE580", secondColor: string = "#338000"): Matrix | | Protanomaly | - | protanomaly(): Matrix | | Deuteranomaly | - | deuteranomaly(): Matrix | | Tritanomaly | - | tritanomaly(): Matrix | | Protanopia | - | protanopia(): Matrix | | Deuteranopia | - | deuteranopia(): Matrix | | Tritanopia | - | tritanopia(): Matrix | | Achromatopsia | - | achromatopsia(): Matrix | | Achromatomaly | - | achromatomaly(): Matrix |

Functions

• concatColorMatrices(...matrices: Matrix[]): Matrix

Matrix type

• A 4x5 matrix for color transformations represented by array - consult Android docs for more specific info about it's format

Misc

• This library was tested only with standard Image component, but in theory it should work with any image that conforms to CMIFImageView protocol or is based on Android ImageView class
• Installing react-native-fast-image is not required - this module doesn't depend on it

Credits

• parrot image by Robert01
• most of color filters are taken from color-matrix project by @skratchdot, Pixi.js sources and Webkit sources
• concatColorMatrices function is based on Android SDK sources
• DuoTone filter based on example by José Manuel Pérez