merge-images-horizontally-with-text

Easily compose images horizontally and add customizable text

Fork of the original merge-images.

This version allows to arrange images only horizontally. You can also add text and a colored background. The function returns a Promise which resolves to a base64 data URI. Supports both the browser and Node.js.

Install

npm install --save merge-images-horizontally-with-text

Usage

With the following images:

`/want.png`	`/eat.png`	`/fries.png`

You can do:

import mergeImages from 'merge-images-horizontally-with-text';

mergeImages(['/want.png', '/eat.png', '/fries.png'], {
  color: 'white',
	text: 'Hello text'
})
  .then(b64 => document.querySelector('img').src = b64);
  // data:image/png;base64,iVBORw0KGgoAA...

And that would update the img element to show this image:

Text font and color

import mergeImages from 'merge-images-horizontally-with-text';

mergeImages(['/want.png', '/eat.png', '/fries.png'], {
  color: 'white',
  fontColor: 'red',
  fontSize: '50px',
  fontType: 'Montserrat',
  text: 'Hello text'
})
  .then(b64 => document.querySelector('img').src = b64);
  // data:image/png;base64,iVBORw0KGgoAA...

Using the same source images as above would output this:

Opacity

The opacity can also be tweaked on each image.

mergeImages([
  { src: 'want.png' },
  { src: 'eat.png', opacity: 0.7 },
  { src: 'fries.png', opacity: 0.3 }
])
  .then(b64 => ...);
  // data:image/png;base64,iVBORw0KGgoAA...

Node.js Usage

Usage in Node.js is the same, however you'll need to also require node-canvas and pass it in via the options object.

import mergeImages from 'merge-images-horizontally-with-text';
const { Canvas, Image } = require('canvas');

mergeImages(['/want.png', '/eat.png', '/fries.png'], {
  color: 'white',
	text: 'Hello text'
})
  .then(b64 => document.querySelector('img').src = b64);
  // data:image/png;base64,iVBORw0KGgoAA...

One thing to note is that you need to provide a valid image source for the node-canvas Image rather than a DOM Image. Notice the above example uses a file path, not a relative URL like the other examples. Check the node-canvas docs for more information on valid Image sources.

API

mergeImages(images, [options])

Returns a Promise which resolves to a base64 data URI

images

Type: array
Default: []

Array of valid image sources for new Image().

options

Type: object

options.format

Type: string
Default: 'image/png'

A DOMString indicating the image format.

options.quality

Type: number
Default: 0.92

A number between 0 and 1 indicating image quality if the requested format is image/jpeg or image/webp.

options.Canvas

Type: Canvas
Default: undefined

Canvas implementation to be used to allow usage outside of the browser. e.g Node.js with node-canvas.

options.crossOrigin

Type: string
Default: undefined

The crossOrigin attribute that Image instances should use. e.g Anonymous to support CORS-enabled images.

options.color

Type CSS Color
default: undefined

The color background that the final image will have.

options.text

Type string
Default: undefined

The text that will be written in the final image.

options.fontSize

Type string
Default: 50px

The fontsize of the text.

options.fontType

Type string
Default: Montserrat

The font used to write the text.

options.fontColor

Type CSS Color
Default: black

The color for the text.

options.Xpadding

Type number
Default: 50

Space in pixels between left border of canvas and text.

options.Ypadding

Type number
Default: 40

Space in pixels between bottom of image and text.

options.YpaddingLines

Type number
Default: 40

Space in pixels between lines.