image-color-utils

DESC

提供取色、色值类似度比照、色调边界值计算等能力。

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
adjust
compare
hex2rgb
rgb2hex

\# ImageColorUtils

import { ImageColorUtils } from 'image-color-utils'const params = {  origin: img,  width: canvas.width,  height: canvas.height,  boundaryValue,  mockMovePx}const imageColorUtils = new ImageColorUtils(params)

Arguments

Name	Desc	Type	Default	required
origin	数据源(能够是 http链接 / ImageBitmap / HTMLImageElement )	string / HTMLImageElement / ImageBitmap /	-	true
width	画板宽度	number	-	false (不传参将依据图片宽高自适应，origin 为 ImageBitmap / HTMLImageElemen，必填)
height	画板高度	number	-	false (不传参将依据图片宽高自适应，origin 为 ImageBitmap / HTMLImageElemen，必填)
mockMovePx	边界扫描间隔（最大边界扫描间隔, 扫描方向由外向外）	number	30	false
boundaryValue	色调边界阈值（作用于色值类似度比照, 阈值越高，类似条件越高）	number	10	false

Returns

Desc	Type
ImageColorUtils实例	Object

\# pickColor - 提取色值

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	指标点间隔画布左上角x坐标	number	-	true
y	指标点间隔画布左上角y坐标	number	-	true

Returns

Desc	Type
指标点 rgb 色值	number[]

\# adjust - 色调边界值计算

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 - 色值类似度比照

import { ImageColorUtils } from 'image-color-utils'const res = ImageColorUtils.compare(color1, color2, boundaryValue)

Arguments

Name	Desc	Type	Default	required
color1	rgb 色值1	number[]	-	true
color2	rgb 色值2	number[]	-	true
boundaryValue	色调边界阈值（作用于色值类似度比照, 阈值越高，类似条件越高）	number	10	false

Returns

Desc	Type
是否类似	boolean

\# hex2rgb - HEX色值转RGB色值

import { ImageColorUtils } from 'image-color-utils'const rgb = ImageColorUtils.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 { ImageColorUtils } from 'image-color-utils'const hex = ImageColorUtils.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