README.md

About

Generate an image thumbnail.

Purpose?

This module will generate an image thumbnail.

By default the thumbnail's file format will be the same as the source file. You can use the jpegOptions option to force output to jpeg.

Usage

imageThumbnail(source, options)

Async/Await (Typescript & ES7)

const imageThumbnail = require('image-thumbnail');

try {
    const thumbnail = await imageThumbnail('resources/images/dog.jpg');
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

Using promises (node 8.x)

const imageThumbnail = require('image-thumbnail');

imageThumbnail('resources/images/dog.jpg')
    .then(thumbnail => { console.log(thumbnail) })
    .catch(err => console.error(err));

Examples

From Uri

const imageThumbnail = require('image-thumbnail');

try {
    const thumbnail = await imageThumbnail({ uri: 'https://images/dogs.jpg' });
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

From Base64

const imageThumbnail = require('image-thumbnail');

try {
    const thumbnail = await imageThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==');
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

From Path

const imageThumbnail = require('image-thumbnail');

try {
    const thumbnail = await imageThumbnail('resources/images/dog.jpg');
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

From Buffer

const imageThumbnail = require('image-thumbnail');

try {
    const imageBuffer = fs.readFileSync('resources/images/dog.jpg');

    const thumbnail = await imageThumbnail(imageBuffer);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

From Stream

const imageThumbnail = require('image-thumbnail');
const fs = require('fs');

try {
    const stream = fs.createReadStream('resources/images/dog.jpg')

    const thumbnail = await imageThumbnail(stream);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

Options

• options:
  • percentage [0-100] - image thumbnail percentage. Default = 10
  • width [number] - image thumbnail width.
  • height [number] - image thumbnail height.
  • responseType ['buffer' || 'base64'] - response output type. Default = 'buffer'
  • jpegOptions [0-100] - Example: { force:true, quality:100 }
  • fit [string] - method by which the image should fit the width/height. Default = contain (details)
  • failOnError [boolean] - Set to false to avoid read problems for images from some phones (i.e Samsung) in the sharp lib. Default = true (details)
  • withMetaData [boolean] - Keep metadata in the thumbnail (will increase file size)
  • flattenBackgroundColor [background colour] - parsed by the color module, defaults to #ffffff.

Examples

const imageThumbnail = require('image-thumbnail');

let options = { percentage: 25, responseType: 'base64' }

try {
    const thumbnail = await imageThumbnail('resources/images/dog.jpg', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

const imageThumbnail = require('image-thumbnail');

let options = { width: 100, height: 100, responseType: 'base64' }

try {
    const thumbnail = await imageThumbnail('resources/images/dog.jpg', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

const imageThumbnail = require('image-thumbnail');

let options = { width: 100, height: 100, responseType: 'base64', jpegOptions: { force:true, quality:90 } }

try {
    const thumbnail = await imageThumbnail('resources/images/dog.jpg', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

License

This project is licensed under the MIT License - see the LICENSE.md file for details.