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How to add image smoothing for an Image using FabricJS?
In this tutorial, we are going to show how you can add image smoothing for an Image using FabricJS. Smoothing gives a smooth effect to the image. We can create an Image object by creating an instance of fabric.Image. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to add image smoothing, we use the imageSmoothing property.
Syntax
new fabric.Image( element: HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | String, { imageSmoothing: Boolean }: Object, callback: function)
Parameters
element − This parameter accepts HTMLImageElement, HTMLCanvasElement, HTMLVideoElement or String which denotes the image element. The String should be a URL and would be loaded as an image.
options (optional) − This parameter is an Object which provides additional customizations to our object. Using this parameter origin, stroke width and a lot of other properties can be changed related to the image object of which imageSmoothing is a property.
callback (optional) − This parameter is a function which is to be called after eventual filters are applied.
Options Keys
imageSmoothing − This property accepts a Boolean value which indicates whether the canvas will use image smoothing while painting the image or not. Its default value is true.
Default Appearance of Image object
Example
Let’s see a code example of how the Image object appears when the imageSmoothing property is not used. In this case, the default value will be used which is true and hence the canvas will use image smoothing.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Default appearance of Image object</h2> <p>You can see that image smoothing has been applied by default</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiating the image element var imageElement = document.getElementById("img1"); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, }); // Add it to the canvas canvas.add(image); </script> </body> </html>
Using the imageSmoothing property and passing it a false value
Example
In this example, we have used the imageSmoothing property and assigned it a false value. Therefore, the canvas will no longer use image smoothing for painting the image.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Using the imageSmoothing property and passing it a false value</h2> <p>You can see that image smoothing is no longer functioning</p> <canvas id="canvas"></canvas> <img src="https://www.tutorialspoint.com/images/logo.png" id="img1" style="display: none" /> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiating the image element var imageElement = document.getElementById("img1"); // Initiate an Image object var image = new fabric.Image(imageElement, { top: 50, left: 110, imageSmoothing: false, }); // Add it to the canvas canvas.add(image); </script> </body> </html>
Conclusion
In this tutorial, we used two examples to demonstrate how you can add image smoothing for an Image using FabricJS
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