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I select an image to Photo Merge to HDR
When you say select AN image, do you mean you are only selecting ONE image? For Photomerge you need to select multiple images.
I am aware of that - actually I included both "HDR" and "Panorama" because I was trying to "practice" what I had just learned. I would not have attempted to Photo Merge just one image for a pano but am aware that one can make pseudo-HDR images from just one image. It was the attempt to do just that which resulted in only a grayed out option offer under Photo Merge for both merging choices which caused me to make this post.
However, the maxim "a little bit of knowledge is a dangerous thing" might be said to apply here, since conventional HDR does require multiple images but 'non-conventional' HDR can sometimes be produced from just one image. Since I had no readily available multiple proper HDR candidates I tried to do a non-conventional single image HDR.
As my posting showed, that didn't work. I find it most disconcerting when I think I've learned something, go to practice it, and then it doesn't work after all. That's what happened here because I tried to practice via a pseudo-HDR "shortcut".
Now you've disabused me of that notion, for which I'm grateful. I just tried a proper multiple image Photo Merge and it worked like a charm.
Thank you for your clear-headed advice. !
It is not possible to create a "pseudo-HDR" image in Lightroom with a single image. The HDR function requires that you have at least two separate images. And you cannot create a copy and adjust the exposure on one of them. You must have at least two separate images.