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The problem with subpixel images is that there are RBG and GBR monitors. Not only that, there are horizontal and vertical variations. And there's no way to tell which one the user is using on the web. And that's not even counting all the mobile number like pentile.

It's still useful though, browsers, for instance, could use it for displaying downscaled images.

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This project is using 'subpixel' not to refer to monitor subpixels, but instead, lost information between existing pixels in an image.

You're right though, and that's why chroma hinting for subpixel AA has fallen out of favor. It also doesn't work on mobile where the screen can be rotated from RGB-horz to RGB-vert at a moment's notice. This was changed for ClearType in Windows 8 (DirectWrite never did chroma hinting).

this is supposed to be used in the data processing step. you load your image from jpeg or your video using ffmpeg, enhance the images and then pass it to the next step where color rendering is done. you can do that in the browser or mobile just as fine.

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