I did some Googling and I found Robin Whalley's YouTube video titled "Was I Fooled into Changing Cameras"

https://www.bing.com/videos/search?q=robin+whalley+youtube+was+i+fooled+into+changing+cameras&docid=607994510043132075&mid=7E6CC576AE63E0915D0A7E6CC576AE63E0915D0A&view=detail&FORM=VIRE

The video is only 15 minutes long and for the first 11 or 12 minutes, the topic was the softness of the focus in the corners when using Lightroom and how much better it was when he used DxO Photolab.

But then he turned his attention into how much of the edge is lost in Lightroom and that it is not lost in DxO Photolab.

I've started shooting in raw format and have noticed a few anomalies that I'm trying to understand. My camera is a Panasonic DMC-FZ300 with a 25-600mm (35mm equivalent) zoom.

When I look at the raw images in Google Photos there are clearly more pixels in the image than LrC is showing. It is as if LrC is cropping all four edges.

Another aspect that mystifies me is that when the lens is not zoomed, i.e., at its widest angle setting, the raw image displayed in Google Photos shows shadows (the lens hood?) at the corners, but when looked at in LrC those corners are cropped.

Below are four screen shots. The first two compare an unzoomed (25mm) image. The second two compare a fully zoomed (600mm) image. Although there are no obvious cropped corners in the latter pair, close examination shows that LrC has cropped the image, e.g., the rocks in the middle of the snow in the upper right corner.

One other difference to notice. LrC says the image is 4000x3000. Google says it is 4016x3016.

Can anyone shed any light on what is going on? Cropping the shaded corners in the unzoomed images is desirable. Does LrC "know" that my Lumix camera's raw images include pixels along the edge that should be cropped?

Although the cropping would generally be desirable on unzoomed images, is there any way to prevent LrC from doing the cropping in those cases where I would like to retain the pixels that have been removed?

FYI, these images are from Rocky Mountain National Park, near the Alpine Visitors Center at roughly 11,000 feet elevation.