Perspective (this is a view from up/downsides, where the clouds/atmosphere behaves differently), and, I presume, different colour processing (fitting the colour spectrum into what is visible to the human eye, which is not necessarily straightforward).

Good question. I went looking for a source and am going to stop now but here are some links.

I suspect the source is one of the social media links here:

https://www.missionjuno.swri.edu/junocam/processing?id=17921

It doesn’t give much info for the specifics of how it was processed:

This processed view enhances cloud-top texture and reveals swirling filaments, compact vortices, and bright high-altitude clouds embedded in a chaotic flow.

It does list the source data for processing as this:

https://www.missionjuno.swri.edu/junocam/processing?id=JNCE_2023250_54C00143_V01

Here is a brief summary of the instrument from one of the groups involved with the Junocam:

https://www.msss.com/all_projects/junocam.php