H2 correct 'inverse' fisheye?

Looking at the posted photo, I am not sure there is an easy fix for this. Most of the suggestions are working off of the thread title, which uses the word “fisheye.” Before the photo was posted, everyone probably thought this was a typical very wide angle view with curved distortion. That can sometimes be easy to fix with a Photoshop tool such as Adaptive Wide Angle.

But now that the photo is posted, it shows it has straight lines. That suggests the panorama was merged using the Perspective projection. Specifically, that means linear perspective. In linear perspective, closer objects are much larger than distant objects. That’s just the way it is, it’s the way the math works out for linear perspective. You will get the same result if you grab a pencil, a piece of paper, a ruler, and start drawing using traditional linear perspective vanishing points and perspective lines: The wider the view, the more the size of edge objects is exaggerated compared to center objects.

One way to try and reduce this is to go back to the source images and merge them using a non-linear projection, such as Spherical or Cyndrilical. The closer people will still be larger than the farther people, but maybe by not as much. But that may bend many of the straight lines. And even then, I kind of doubt any filters or wide angle correction features will make the head sizes more consistent, because the fact is, the people at the near side of the table are still closer than the people at the far side, and even in the real world, that means the closer people look bigger.