Ultra HDR Export for Lightroom Classic
Export filter plugin: merges your JPEG with an internal HDR pass into one Ultra HDR (gain map) file using uhdr_repack.
How to install
-
Unzip the download. In Lightroom Classic, choose File → Plug-in Manager → Add and select the
ExportHDR.lrpluginfolder. -
When exporting, open Post-Process Actions, add Ultra HDR Export → Encode Ultra HDR JPEG (uhdr_repack).
Post-Process Actions: Ultra HDR Export → Encode Ultra HDR JPEG. -
Under File Settings, choose JPEG (recommended) so Lightroom renders a normal SDR base; the plug-in replaces the output with an Ultra HDR
.jpg. Use a color space such as sRGB as needed.
File Settings: JPEG and quality. -
Adjust Image Sizing and plug-in options as needed, then click Export.
Image Sizing and Export.
Uploading to Instagram (feed)
For feed posts, upload the exported image through Instagram in your browser (or your usual workflow). Then:
- Choose Original ratio so Instagram does not crop your photo.
- Do not apply Instagram filters or extra corrections — keep the file as exported.
Feed image sizes (reference)
At 1080 px wide, portrait height can go up to 1440 px — aspect ratio 3:4 (replacing the older 4:5 portrait limit).
- Square: 1080×1080 px (1:1)
-
Portrait at 1080 px wide:
1080×1350 (4:5) — previous portrait size.
1080×1440 (3:4) — max portrait height at that width. - Landscape: 1080×566 px (1.91:1)
Requirements: Lightroom Classic 14+, macOS 26 (Tahoe), ARM64. Source: GitHub repository.