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I have converted the uploaded image into progressive in backend using Node GM and stored in the file. After that, I want to show that converted progressive images in front-end. My problem is when I rendered that image its getting rendered line by line. But compared to normal image these progressive images are loading first.
But I want to load that images from blur to normal. How can I do this?
In the frontend, I have written the code using HTML like this.
<html>
<head></head>
<body>
<h1>Hello</h1>
<img style="width:50%" src="https://www.dropbox.com/s/p57ik1kl04k1iax/progressive3.jpg?raw=1" />
<img style="width:30%" src="https://www.dropbox.com/s/3nnc03tfwxrpu5q/Porsche-GT2-4K-UHD-Wallpaper.jpg?raw=1" />
</body>
</html>
208
A progressive image is interlaced meaning the image will start out as low quality, however will continue to improve in resolution with each additional "pass". Traditionally, images load from the top-down (for JPEG images these are called Baseline JPEG).
progressive option is only available to jpg, png and webp.
A progressive JPEG image is encoded differently than a standard or baseline JPEG image. It loads in successive waves until a clear picture is formed. This can improve a website's performance as the images seems to be loading faster.
At first I couldn't understand why this seemed to be loading in as a baseline image but using Chrome's developer tools, zooming in and throttling the connection showed me what was going on.
Your progressive image is loading in the way you expect, with an initial low resolution image, followed by progressively more detail. The first pass loads in line by line and therefore behaves like a baseline image.
The problem is that the image is so huge, at over 5000 pixels wide, that it's being resized in the browser to the extent that there's no visible improvement in picture quality after the initial image has been downloaded.
In order for the blurred-to-sharp effect to be noticeable, the image would need to be much smaller in pixel dimensions. If it's being embedded on a web page, resize it to the largest size you'd expect it to be viewed at, so at 50% of screen width on a 1920 wide screen, you would want to resize to 960 pixels across. Now the file size will also be much smaller and the image will download faster, so unless you are on a very slow connection it still might not be obvious that the jpeg is loading progressively.
If you need the full size image available to users for printing or some other purpose, then you can always add a separate link on the page along with a warning on the file size.
Eg.
<a href="https://www.dropbox.com/s/p57ik1kl04k1iax/progressive3.jpg?raw=1">Print quality image (11.1 MB)</a>
181
You need to have two images
You need put
<img id="image" style="width:100%, height: auto; filter: blur(5px); transition: 1s filter linear;" src="small image source" />
then do
fetch('big image source').then((response) => response.blob()).then((blob) => {
let img = document.querySelector('#image');
img.onload = () => URL.revokeObjectUrl(img.src)
img.src = URL.createObjectUrl(blob)
img.style.filter = 'none';
})
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