Jeff's AppsFirst, check the browser's display path
Raise your display brightness, turn off Low Power Mode, and view this page in Safari on a recent iPhone, iPad, or Mac. This check reports whether the browser says it can send high-dynamic-range content to the current screen.
The first three blocks are ordinary SDR reference levels. The fourth uses an HDR-white image. On a working HDR path, it should rise above the SDR-white block without losing its clean edge.
A standard-range result does not mean the screen is broken. The browser may be using an SDR path, the display may have little headroom left at its current brightness, or a power or accessibility setting may be limiting intensity.
Now compare a real image
The sample below uses the same HDR image path as the Easy HDR Glow product preview. In HDR mode, the moon should rise above ordinary white while the night sky and mountain remain controlled. On an SDR path, the browser will tone-map it into the normal range.
What can change the result
- Display brightness: an HDR screen needs room above its normal white level.
- Power and thermal state: a warm device or Low Power Mode can reduce peak brightness.
- Browser support: the same file can look different in Photos, Safari, a social app, or an embedded browser.
- Ambient light: a highlight that looks dramatic indoors may feel less obvious in direct sun.
A better real-world check
Open the same HDR photo in Photos and in the destination where you intend to use it. Compare a lamp, reflection, or moon against nearby white interface elements. If the picture's highlight clearly exceeds the interface white while the rest remains controlled, you're seeing the effect HDR is meant to provide.