![]() In the init function let’s add another event listener similar to the one we did earlier. We need to give users the ability to move the image back into the center of frame. Even if you already have a free account you can get a 30-day free trial here. Good news, bad news: Resizing is easy but requires Canva Pro. The first is one-click resize of the canvas. Now that we can resize the image from any of its corners you might have noticed we can inadvertently change its position on the page. Resize an Image in Canva There are two ways to resize an image in Canva. We are now checking to see which resize-handle has been dragged and we’re moving the image while resizing it so that it appears as though the correct corner remains fixed. First, define the styles for the resize-container and the image.resize-container ) That’s it! That’s all the HTML we need for this demo. Under Custom Size, select px from the drop-down list. If that’s not enough yet, select your photo and click Resize on the upper portion of the interface. You can make sharper images first by unblurring them to bring clarity and crisp edges. In our demo we’re going to start with an existing image: You can enhance the photo resolution of an image by using our image enhancer tool. If you don’t see the blue arrows, try clicking on the image again. You’ll see blue arrows appear around the image. ![]() With that in mind, let’s get started! The Markup If you can’t see the image, make sure it’s not behind a text box or other element. Take a look at the final result in this demo or download the ZIP file. There are some techniques to improve the quality of images downscaled with canvas, but they are not covered in this tutorial. If quality is important you may find the resized image looks undesirable due to how the browser resampled it. It makes sense to set reasonable limits on the file size just as you would when uploading a file. ![]() Resizing very large images can cause the browser to slow down or in some cases, even crash. Most browsers have good support for these methods, so you can probably use this technique right now, however just be aware of some limitations unrelated to browser support such as quality and performance. There are free tools available online to do image manipulation. It would not reduce the file size to 50Kb. We do this by creating an HTML5 element and drawing the image to the canvas at a particular size, then extracting the new image data from the canvas as a data URI. In fact, if you upload a large image in your course (lets say the dimensions are 1000圆00), and the file size is 100Kb, that file size will not be reduced if you re-size the image in Canvas to, say, 500x300. Instead we can resize the image on the client side before uploading it, which is fast. Whilst we could do this on the server, it would require the transfer of a potentially large file, which is slow. ![]() In a real world example a website or app might use a technique like this to resize and frame a profile picture before uploading. In this tutorial we’re going to learn how to resize and crop an image using the HTML5 element, and while we’re at it, let’s create some fancy controls for resizing, commonly seen in photo editing applications. From our sponsor: Design and publish websites for clients in one go-with Readymag ![]()
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