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CSSStyleDeclaration JS Conversion


Canvas ImageData data Property

❮ Canvas Reference

Example

Create a 100*100 pixels ImageData object where every pixel is set to the color red:

Canvas

YourbrowserdoesnotsupporttheHTML5canvastag.

JavaScript:

const c = document.getElementById("myCanvas");
const ctx = c.getContext("2d");
const imgData = ctx.createImageData(100, 100);

for (let i = 0; i < imgData.data.length; i += 4) {
  imgData.data[i+0] = 255;
  imgData.data[i+1] = 0;
  imgData.data[i+2] = 0;
  imgData.data[i+3] = 255;
}
ctx.putImageData(imgData, 10, 10);
Try it Yourself »

Description

The data property returns an object that contains the image data of an ImageData object.

For every pixel in an ImageData object there are four pieces of information, the RGBA values:

R - The color red (from 0-255)
G - The color green (from 0-255)
B - The color blue (from 0-255)
A - The alpha channel (from 0-255; 0 is transparent and 255 is fully visible)

The color/alpha information is held in an array, and is stored in the data property of the ImageData object.

Examples:

The syntax for making the first pixel in the ImageData object red:

imgData = ctx.createImageData(100, 100);

imgData.data[0] = 255;
imgData.data[1] = 0;
imgData.data[2] = 0;
imgData.data[3] = 255;

The syntax for making the second pixel in the ImageData object green:

imgData = ctx.createImageData(100, 100);

imgData.data[4] = 0;
imgData.data[5] = 255;
imgData.data[6] = 0;
imgData.data[7] = 255;

Syntax

imageData.data

Browser Support

The <canvas> element is an HTML5 standard (2014).

imageData.data is supported in all modern browsers:

Chrome Edge Firefox Safari Opera IE
Yes Yes Yes Yes Yes 9-11

❮ Canvas Reference