HDR: what it is, how it works and what it does

Definition and Principles

HDR (High Dynamic Range) is an image processing standard that allows for a wider range of luminance and color to be captured or reproduced compared to standard technologies (SDR). Its primary goal is to provide greater visual fidelity, showing details in shadow and bright areas that would otherwise be lost.

Architecture and Function

HDR functionality manifests in two main areas within consumer electronics:

• In displays: HDR compatibility allows the device to display content with higher peak brightness, deeper blacks, and a wider color gamut. This requires display hardware capable of achieving certain brightness levels and an image processor that interprets content metadata.
• In cameras: The HDR function in front or rear cameras involves capturing multiple exposures or using sensors with a higher dynamic range. The software combines these images to create a final result where both very bright and very dark areas retain their detail.

Applications and Scope

The presence of HDR is common in modern mobile devices, televisions, and monitors. In the context of smartphones, it is associated with the ability to play videos in formats like HDR10 or Dolby Vision, and with improving the quality of selfies and photos in high-contrast lighting conditions.

Limitations and Interpretation

The "HDR" label in technical specifications indicates the capability of the hardware or software to support this technology, but it does not guarantee that all available content is HDR. Furthermore, the quality of the visual experience depends on the specific implementation by the manufacturer and the ambient lighting conditions.