Webgl getimagedata. You can read the pixel data on a canvas using the getImageData () method. The getImageData () allows you to get the pixel data from any rectangular area. getImageData. Jan 8, 2018 · How does one "draw a WebGL canvas inside a 2D canvas" in such a way that the 2D canvas will hold the pixel data of the first one? Can't seem to get that to work Jul 7, 2025 · Learn about the ImageData interface, including its properties, specifications and browser compatibility. . Note: The ImageData object is not a picture, it specifies a part (rectangle) on the canvas, and holds information of every pixel inside that rectangle. WebGL has to take it even one step further. Image data includes the colour of the pixel (decimal, rgb values) and transparency (alpha value). getImageData () method, including its syntax, code examples, specifications, and browser compatibility. Jul 2, 2025 · Learn about the CanvasRenderingContext2D. First you draw the image into the canvas. Dec 8, 2019 · 读取canvas 的像素，应该是一件很简单且基础的事。 就像在canvas 2d 里，使用其上下文对象的getImageData () 方法就可以轻松搞定。 The getImageData() method returns an ImageData object that copies the pixel data for the specified rectangle on a canvas. Then you get the data. But, if the image you drew came from a different domain the browser will mark the canvas as tainted and you'll get a security error when you call ctx. nezsk wdcz sogfh fmn omgf tfm mgab kufrr tccs gygvp
26th Apr 2024