Use NWIS branding images within the app - see Branding. Avoid using other images unless a real user need exists (GOV.UK Design System).
The app design must:
- Display images at their intended aspect ratio
- Use PNG files (iOS Human Interface Guidelines)
- Provide alternative text labels either immediately adjacent to the image or on selecting the image, to support screen readers - see Accessibility (Material.io, iOS Human Interface Guidelines)
- Download images from a server with image caching enabled, to allow faster app loading and to reduce the size of the app itself