Image size and direction

Hi
There is originWidth and originHeight in media fields of “Products” collection
ex: wix:image://v1/76f894_ac383c053e40483db1cd1ec3bb803138~mv2.jpg/file.jpg#originWidth=672&originHeight=960

On other hand in Custom collection image fields d_2946_1992
ex: image://v1/76f894_e500733e697c4bce93936f2e60a64078~mv2_d_2946_1992_s_2.jpg/2946_1992/Petrusha1.jpg

How it can be used to identify portrait and landscape? Why it is different?