>>13155781There are lines that indicate use of polygonal lasso on that one, but someone else edited it to highlight them and then shrank the whole image here:
>>13155767 so you can't see the very obvious difference in compression artifacts in and outside of the selected area.
They slapped a polygonal lasso around the LEM to preserve the image quality of the important part of the photo while letting the rest of the image use higher compression. As a result that image is about 10x smaller in filesize than the full quality one linked here
>>13155777 