Javascript optimize image before upload10/29/2023 ![]() Image with image-rendering: optimizeQuality set and scaled with width/height: This is what the different methods resulted in: I tried the other methods suggested and none of them look any better. Seems I was mistaken, the linked website wasn't doing any better of a job of downsizing the image. Var cop圜ontext = canvasCopy.getContext("2d") Ĭtx.drawImage(canvasCopy, 0, 0, canvasCopy.width, canvasCopy.height, 0, 0, canvas.width, canvas.height) Var canvasCopy = document.createElement("canvas") ![]() Here is the relevant code: reader.onloadend = function(e) I have tried resizing the same jpg on the linked site and in photoshop, and it looks fine when downsized. Is there something I'm missing, some setting that needs to be set or something? I've tried using the same code they do as shown in the "" link, but it still looks terrible. I know its possible to get this to look right, because this site can do it just fine using a canvas as well. It looks as if it was downsized in photoshop with the resampling set to 'Nearest Neighbor' instead of Bicubic. Select one or more image files in the file input below to test out the code, no worries, nothing is uploaded, everything stays in the browser.I'm trying to create a thumbnail image on the client side using javascript and a canvas element, but when I shrink the image down, it looks terrible. addEventListener ( 'change', ( e ) => ) Get the selected files from the file input const input = document. ![]() We’ll handle the TODO items in the next section. Let’s set up a file input field, we’ll listen for the "change" to detect when the user has selected one or more files. To prevent other files from being added we can optionally set the file input accept attribute to "image/*" ![]() ![]() The multiple attribute enables selection of more than one file. In the example below we’ll accept all kinds of files but will only compress the images. If you’re in a hurry, or find it easier to read the code itself, you can jump to the final code snippet here Getting The Selected Image Files To make sure users can upload their images and prevent super big images from being uploaded we can compress image data before upload without bothering the user with all kinds of requirements. We’ll compress images and save them back to the file input ready for upload. In this quick tutorial we’ll use JavaScript to compress images selected with a file input element. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |