The photographs are the listing
Why correcting exposure on upload matters more than any amount of copywriting, what enhancement may and may not do to a property photograph, and why the original is never overwritten.
A property listing is a set of photographs and a number. The description matters, the specification matters, but neither of them is what a buyer is actually looking at, and neither is what makes them message you.
Which makes it strange how much of the industry treats photographs as an upload step.
Most property photographs are underexposed
A room with a window in it is a hard exposure. Expose for the room and the window blows out; expose for the window and the room goes muddy. A phone shooting automatically will usually split the difference and produce something duller than the room actually was.
Correcting exposure, colour and sharpness on the way in fixes the majority of that, and it costs the agent nothing because it happens as the file arrives.
What enhancement may not do
There is a line between correcting a photograph and misrepresenting a property, and it matters more here than in most markets.
Removing an object from a room, changing a view out of a window, or upscaling a small image into a resolution claim it cannot support are all on the wrong side of it. Onshow does none of them. Every page carries a standing disclosure that images are enhanced and originals are available on request, because a buyer is entitled to know what they are looking at.
Four sizes, not one
A photograph that looks right full screen on a laptop is several hundred kilobytes too large for a thumbnail in a grid. Serving one file for both means either a slow grid or a soft hero.
So every photograph is encoded to four widths in the same pass as the correction, and the page asks for the one that matches the space it is going into. On a thirty-card portfolio that is the difference between a page that loads and a page somebody abandons.
The original is never overwritten
Enhancement writes new files. The photograph you uploaded stays exactly as it was, downloadable at full resolution, for as long as the listing exists.
That is partly a trust position and partly practical: the portals want the original, your photographer may want it back, and a product that quietly replaced your files would be holding your work hostage.