Your Posters Live on Our Servers, Not Somebody Else's
The poster artwork on your credits page is stored here and served from our own delivery network, rather than being pulled from IMDb's servers each time somebody looks at your site. That sounds like an implementation detail. It is the difference between a credits page that keeps working and one that quietly falls apart.
Why hotlinking someone else's images is a bad bet
If a page points at an image on another company's server, that company decides whether your page still works. When they remove or rename a file, the image on your site becomes a broken box, and nothing tells you it happened.
It also does not fail all at once, which would at least be noticeable. It fails one image at a time, over years, with no pattern. A credits page slowly acquires gaps and the owner is usually the last to see them, because you stop looking at a page you finished two years ago.
Holding your own copy removes the dependency entirely. Nearly 3,000 posters are stored here, keyed by the artwork rather than by the credit, so a production several actors share resolves to one stored file rather than a copy each.
How the right poster gets attached
This is the part worth being careful about, because a search for a film title can very confidently return the wrong film. That risk is covered in reel chapters pulling their own credits.
Artwork is accepted only from a candidate whose identifier matches the one already verified for that credit. The identifier decides which production it is; a search only supplies a picture for a production that has already been settled. It cannot attach the poster of a different film with a similar name.
Your own upload always wins
An existing poster is never overwritten. If you uploaded artwork for a credit, that stays, because you chose it and whatever a database happens to file first is not an improvement on a deliberate choice.
That is worth knowing as a lever: if a credit shows artwork you dislike, or shows none because none exists anywhere, upload your own and it is settled permanently.
Related: credits and filmography, sorting credits, genres for every project, and image hosting on a global CDN, which is the same principle applied to your photographs.
