HDR Diagnostics

Use Chrome 106 or later to view this page.

The background of this page is SDR white (UI white, or 8-bit 0xff).

All images are in the AVIF format.

The following three images are 8-bit Standard Dynamic Range (SDR). They use (from left to right) the Display P3, Adobe RGB, and Rec 2020 color spaces. The images should appear identical.

SDR Display P3

SDR Adobe RGB

SDR Rec 2020

The following images have identical content to the above SDR images. However, they are signaled using High Dynamic Range (HDR) transfer curves, Hybrid Log-Gamma and Perceptual Quantizer. Since the content of the images is SDR, these images should look identical to the above three images. However, as of version 106 in Chrome, they do not. On a HDR display, the HLG image (bottom-left) is much brighter, due to the application of the HLG OOTF and scaling the values to fill the displayable range. The PQ image (bottom-right) is darker, because of Chrome's tone mapping that maps 10000 nits to the display's current peak luminance value.

HDR Rec 2020 HLG
HDR Rec 2020 PQ

The following images have identical content to the above SDR images. However, they are signaled using High Dynamic Range (HDR) transfer curves, Hybrid Log-Gamma and Perceptual Quantizer. Since the content of the images is SDR, these images should look identical to the above three images. However, as of version 106 in Chrome, they do not. On a HDR display, the HLG image (bottom-left) is much brighter, due to the application of the HLG OOTF and scaling the values to fill the displayable range. The PQ image (bottom-right) is darker, because of Chrome's tone mapping that maps 10000 nits to the display's current peak luminance value.
HDR Rec 2020 HLG	HDR Rec 2020 PQ