blueimp-canvas-to-blob

What is blueimp-canvas-to-blob?

The blueimp-canvas-to-blob npm package is a JavaScript library that provides a polyfill for the standard HTML5 canvas.toBlob method. This method allows you to convert canvas elements to Blob objects, which can then be used for file uploads, image processing, and other tasks that require binary data.

What are blueimp-canvas-to-blob's main functionalities?

Convert Canvas to Blob

This feature allows you to convert a canvas element to a Blob object. The code sample creates a canvas, draws a red rectangle on it, and then converts the canvas to a Blob object in PNG format.

const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'red';
ctx.fillRect(10, 10, 100, 100);
canvas.toBlob(function(blob) {
  console.log(blob);
}, 'image/png');

Specify Image Type and Quality

This feature allows you to specify the image type and quality when converting a canvas to a Blob. The code sample creates a canvas, draws a blue rectangle on it, and then converts the canvas to a JPEG Blob with 75% quality.

const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'blue';
ctx.fillRect(10, 10, 100, 100);
canvas.toBlob(function(blob) {
  console.log(blob);
}, 'image/jpeg', 0.75);

Other packages similar to blueimp-canvas-to-blob

canvas-toBlob

The canvas-toBlob package is another polyfill for the HTML5 canvas.toBlob method. It provides similar functionality to blueimp-canvas-to-blob, allowing you to convert canvas elements to Blob objects. The main difference is that canvas-toBlob is a smaller and more lightweight package.

html2canvas

The html2canvas package allows you to take screenshots of web pages or parts of web pages and convert them to canvas elements. While it offers more comprehensive functionality than blueimp-canvas-to-blob, it can also convert the resulting canvas to a Blob object. This makes it a more versatile but heavier option.

dom-to-image

The dom-to-image package enables you to convert DOM nodes to images, including canvas elements. It provides more flexibility in terms of what can be converted to an image, but it also includes the ability to convert the resulting canvas to a Blob object. This package is useful if you need to capture more than just canvas elements.

README

The README file is missing