Image Studio draws from the same unified monthly credit balance as video generation.
Every edit carries an output resolution you choose: 2K (2048 px on the long edge) is the default and covers MLS, social, and listing pages, and 4K is available on the same edit when a photo is going to print or a large display. The exact cost is shown on the option row in the composer before you apply, so you always see the price first.
The 2K tier is the default on every edit; the 4K tier costs about twice as much because the model spends roughly twice the GPU time.
Image Studio edits are charged only after they succeed, so a failed edit costs you nothing at all.
Always read the displayed cost in the composer rather than assuming a number. The platform is the source of truth, and we keep dollar pricing for top-up packs in Settings > Billing & Plans.