What is ComfyUI doing to images in nodes when you hover over and click them (when previewing a batch of images to select one)?

[Auxiar]

To preface, I'm certain the answer is in the code somewhere otherwise it wouldn't be happening at all, and I have looked for the last hour for any sort of clue as to what it is, but I have come up with absolutely nothing, so I'm resorting to these discussions.

What I'm looking for is what methods are used to shift the colors/tones of generated images whenever you're hovering and selecting them within a Preview Image node. There's a certain amount of shifting that occurs when hovering, and a deeper shifting that happens when you click the image.

You can see the color/tone shifting that I'm talking about in the following gif:

I am aware that the effect can be duplicated by simply adjust some parameters like Contrast or Black Point in editing software. However, seeing as how this is happening on the web interface, I feel like it's probably a much simpler method than even those.

I've tested several different possible methods in my editing software to try and recreate these color differences, but I'm getting nothing without more extensive editing methods, which while possible in web, I figure isn't going on in this instance.

I'm asking because I'd like to be able to recreate this or otherwise export the generated images with this effect already applied because the default images are a little bit bland in comparison; However, as mentioned, I'm getting nowhere fast with my testing of this.

I'm looking for the exact method used in the UI, not necessarily a way to recreate it. If anyone has any insight as to what's happening then I'd appreciate the response, as I'm at a loss at this point.