image-color-utils

DESC

提供取色、色值相似度对比、色彩边界值计算等能力。

demo

codesandbox

Install

npm install image-color-utils --save

Usage

es

import { ImageColorUtils } from 'image-color-utils'

commonjs

const { ImageColorUtils } = require('image-color-utils')

API

• ImageColorUtils
• pickColor
• pickColors
• adjust
• compare
• hex2rgb
• rgb2hex

# ImageColorUtils

import { ImageColorUtils } from 'image-color-utils'

const params = {
  origin: img,
  width: canvas.width,
  height: canvas.height,
  boundaryValue,
  mockMovePx,
  onload,
}
const imageColorUtils = new ImageColorUtils(params)

Arguments

Name | Desc | Type | Default | required ---- | ---- | ---- | ----- | ---- origin | 数据源(可以是 http链接 / ImageBitmap / HTMLImageElement ) | string / HTMLImageElement / ImageBitmap / | - | true width | 画板宽度 | number | - | false (不传参将根据图片宽高自适应，origin 为 ImageBitmap / HTMLImageElemen，必填) height | 画板高度 | number | - | false (不传参将根据图片宽高自适应，origin 为 ImageBitmap / HTMLImageElemen，必填) mockMovePx | 边界扫描距离（最大边界扫描距离, 扫描方向由内向外） | number | 30 | false boundaryValue | 色彩边界阈值（作用于色值相似度对比, 阈值越高，相似条件越高） | number | 10 | false onload | 加载完成 | ()=>void | - | false

Returns

Desc | Type -------- | -------- ImageColorUtils实例 | Object

# pickColor - 提取单个色值

import { ImageColorUtils } from 'image-color-utils'


const imageColorUtils = new ImageColorUtils({
  origin: img,
  width: canvas.width,
  height: canvas.height
})
const res = imageColorUtils.pickColor(x, y)

Arguments

Name | Desc | Type | Default | required -------- | -------- | -------- | -------- | ----- x | 目标点距离画布左上角x坐标 | number | - | true y | 目标点距离画布左上角y坐标 | number | - | true

Returns

Desc | Type -------- | -------- 目标点 rgb 色值 | number[]

# pickColors - 提取图片色值

import { ImageColorUtils } from 'image-color-utils'


const imageColorUtils = new ImageColorUtils({
  origin: img,
  width: canvas.width,
  height: canvas.height
})
const res = imageColorUtils.pickColors()

Returns

Returns

Desc | Type -------- | -------- 图片色值 | {rgb: string[], hex: string[] }

# adjust - 色彩边界值计算

import { ImageColorUtils } from 'image-color-utils'

const imageColorUtils = new ImageColorUtils({ 
  origin: img,
  width: canvas.width, 
  height: canvas.height,  
  boundaryValue,
  mockMovePx
})
imageColorUtils.adjust(leftTopPosition, rightBottomPosition)

Arguments

Name | Desc | Type | Default | required -------- | -------- | -------- | -------- | ----- leftTopPosition | 图片所选区域初始左上角坐标 | number[] | [] | false rightBottomPosition | 图片所选区域初始右下角坐标 | number[] | [] | false

Returns

Desc | Type -------- | -------- 边界计算后左上角坐标(x,y)及区域宽高(width,height) | Object:{x: number, y: number, width: number, height: number}

# compare - 色值相似度对比

import { ImageColorUtils } from 'image-color-utils'

const res = ImageColorUtils.compare(color1, color2, boundaryValue, type)

Arguments

Name | Desc | Type | Default | required -------- | -------- | -------- | -------- | ----- color1 | rgb 色值1 | number[] | - | true color2 | rgb 色值2 | number[] | - | true boundaryValue | 色彩边界阈值（作用于色值相似度对比, 阈值越高，相似条件越高） | number | 10 | false type | 颜色模型 | 'rgb' or 'lab' | 'rgb' | true

Returns

Desc | Type -------- | -------- 是否相似 | boolean

# hex2rgb - HEX色值转RGB色值

import { hex2rgb } from 'image-color-utils'

const rgb = hex2rgb(hex)

Arguments

Name | Desc | Type | Default | required -------- | -------- | -------- | -------- | ----- hex | HEX色值 | String | - | true

Returns

Desc | Type -------- | -------- RGB色值 | number[]

# rgb2hex - RGB色值转HEX色值

import { rgb2hex } from 'image-color-utils'

const hex = rgb2hex(rgb)

Arguments

Name | Desc | Type | Default | required -------- | -------- | -------- | -------- | ----- rgb | RGB色值 | number[] | - | true

Returns

Desc | Type -------- | -------- HEX色值 | string

Attribute

import { ImageColorUtils } from 'image-color-utils'

const imageColorUtils = new ImageColorUtils({ 
  origin: img,
  width: canvas.width,
  height: canvas.height,
  boundaryValue,
  mockMovePx
})

console.log(imageColorUtils.canvas)
console.log(imageColorUtils.ctx)
console.log(imageColorUtils.imageData)

Name | Type --- | --- canvas | OffscreenCanvas ctx | OffscreenCanvasRenderingContext2D imageData | ImageData