Ghost Strips HDR Gain Map

With iOS 18, Apple launched “Adaptive HDR.” This is a system of embedding an HDR representation of an image within an SDR image, allowing HDR support among legacy formats such as JPEG. While Adaptive HDR is Apple’s branding, this technology has existed for several years under Adobe’s Gain Map Initiative, and now a draft ISO standard (ISO/DIS 21496-1). It appears that this HDR representation gets stripped by Ghost as part of its image optimization step, when it strips EXIF data. By just not stri...