Changing an Image element to a Blob using CSS3 filters

Consider the given HTML setup:

<div id="image-blob" class="filter-wrapper">
    <img id="pic" src="">
</div>

I have applied CSS3 filters like 

-webkit-filter: blur(1px) brightness(1.5) contrast(1.8) drop-shadow(black 16px 16px 20px) grayscale(0.2) hue-rotate(90deg) invert(0.1) saturate(3.6) sepia(0.3);
to the <img> element.

My query is whether it is feasible to convert this modified image with filters into a downloadable blob without any involvement of server-side processing or proxy?

Please note: The client-side downloading process utilizes FileSaver.js, and potential conversion to canvas can be achieved using HTML2Canvas.

Edit:

Upon further investigation, it seems that achieving this may not be possible (although I welcome any insights proving otherwise). Another solution could involve replicating these filters through JavaScript directly within the canvas. You may refer to the Pixel Manipulation Tutorial or opt for a reliable library like CamanJS.

javascripthtmlcsshtml5-canvas

Answer №1

@NielsKeurentjes made a valid point about browsers restricting the ability of JavaScript to save web page content locally for security reasons.

But here's an alternative suggestion: utilize canvas for applying image filters.

You can then convert the canvas to an image and open the modified image in a new browser tab. Simply instruct users to "right-click-save-as" to save the image.

I recommend this approach for a few reasons:

  • Users are generally familiar with and comfortable using the right-click-save-as method.

  • If you attempt to bypass browser restrictions through hacks, it could lead to security issues and potential bans. Moreover, hacks are often problematic when dealing with different browsers.

By the way:

Another useful image filter library besides CamanJS is Pixastic:

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