If you have MacOS, Keynote, and an HDMI connection to a TV, you can create a slideshow using HDR photos which will play by itself.

Requirements: MacOS Sequoia (ie v15.0 or later) and latest Keynote.

To create the slideshow:

• Export images in an HDR format supported by Keynote (HDR JPG / AVIF / JXL from latest Adobe Lightroom Classic / ACR works well).
• Make a series of slides with those images.
  • Note: the headroom will be limited (not full HDR support) while building the slide. You will only see proper HDR when you play the slideshow (below).
• Each image should have an animation.
  • Click the image to select it, then near the top right under “animate”, set the preferred “build in” effect.
  • Try using “dissolve” to fade in, “fade and scale” to zoom in, or perhaps “blur”.
  • Set the duration for about 1.0 seconds.
• At the top-right of Keynote, click “document” and set the following:
  • presentation type = “self-playing“
  • delay = about 3-5 seconds (this is how long each slide/image will be visible)
  • builds = 0 seconds (this just adds delay before starting the animation on each slide).
  • enable “loop slideshow” if preferred.
• Go to the “Play” menu and make sure “in fullscreen” is checked.
• Click the “Play” button at the top to start (or shortcut key <option><shift><P>)

Please let me know what you think (any other settings you like, etc).