Jeff's AppsSDR establishes the familiar baseline
Standard dynamic range places practical limits around ordinary screen white. A well-made SDR image can still have excellent contrast and color. Its brightest lamp, cloud, or reflection simply has to fit beneath that ceiling.
HDR reserves space above white
On a capable screen, selected pixels can exceed the white used by surrounding text and interface controls. That extra range is most persuasive when it belongs to something that would be bright in the scene: fire, sun on water, polished metal, snow, or a light source at night.
| Question | SDR | HDR |
|---|---|---|
| Brightest level | Fits within reference white | Can rise above reference white |
| Older software | Widely predictable | Needs a good fallback |
| Best use | Consistent everyday display | Controlled luminous highlights |
| Main risk | Highlights can feel compressed | Poor edits can look harsh or uneven |
The middle of the image should not disappear
If every light tone is pushed upward, the picture stops feeling dimensional. Good HDR work protects faces, midtones, and color while concentrating the expansion near the top of the range. The viewer notices the light, not the processing.