How To Create Background Like TV Noise In A Canvas

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▲ Open In App How to Create Background Like TV Noise in a Canvas ? Last Updated : 25 Jul, 2024 Summarize Comments Improve Suggest changes Like Article Like Save Share Report Follow

TV noise is a random black-and-white dot pixel pattern displayed when no transmission signal is obtained by the receiver antenna of television sets or other such devices. To create that scenario as a background we will need HTML, CSS, and JavaScript. HTML is used to create the canvas area or you can use the whole background as an area. CSS will be applicable for designing the background and JavaScript will create the TV noise animation. We will accomplish that in stepwise. The below steps are mentioned and described one by one.

noisetv

Example:

html <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>TV noise Background</title> </head> <body> <canvas id="canvas"></canvas> <h1>GeeksforGeeks</h1> <h2>A Computer Science Portal for Geeks</h2> <h3>Animated TV noise Background</h3> </body> </html> CSS <style> #canvas{ z-index:-100; position:absolute; top:0; left:0; opacity:0.8; background-color:#fff; } h1{ color:green; font-size:50px; margin-bottom:0; } body{ text-align:center; } </style> JavaScript <script> varcanvas=document.getElementById('canvas'), /* The getContext() method returns an object that provides methods and properties for drawing on the canvas. */ ctx=canvas.getContext('2d'); /* Setting canvas width and height equal to window screen width and height. */ functionresize(){ canvas.width=window.innerWidth; canvas.height=window.innerHeight; } resize(); window.onresize=resize; // Function to generate noise effect functiongenerate_noise(ctx){ varw=ctx.canvas.width, h=ctx.canvas.height, /* This creates a new ImageData object with the specified dimensions(i.e canvas width and height). All pixels are set to transparent black (i.e rgba(0,0,0,0)). */ idata=ctx.createImageData(w,h), // Creating Uint32Array typed array buffer32=newUint32Array(idata.data.buffer), buffer_len=buffer32.length, i=0 for(;i<buffer_len;i++) buffer32[i]= ((255*Math.random())|0)<<24; /* The putImageData() method puts the image data (from a specified ImageData object) back onto the canvas. */ ctx.putImageData(idata,0,0); } // Creating animation effect vartoggle=true; (functionloop(){ toggle=!toggle; if(toggle){ // Loop function is called each time // before next repaint. requestAnimationFrame(loop); return; } generate_noise(ctx); requestAnimationFrame(loop); })(); </script>

Output: Click here to see the live output 

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