Working with Ultra HDR JPGs (opens in new tab)

My Pixel phone takes nice HDR images and saves them as UltraHDR. (aka ISO 21496-1 or Adaptive HDR). These files look and act mostly like normal JPEGs but HDR-aware software can find a second raster image in there with a “gain map” which has extra brightness information for boosting the image into 10 bit HDR. […]