In QGIS 3.8.2 I georeferenced a set of aerial photos from USGS Earthexplorer website and decided that I need to photoshop them to brighten them. So I photoshopped the original ungeoreferenced source images and saved them at the same resolution/size.
Then I opened one of these processed images in QGIS Georeferencer and loaded the GCP points I had previously created for the unprocessed source image. The points load above the processed image as shown in the picture below.
There may be some geodata in these images from the USGS website that gets reversed somehow when I am saving them in Photoshop?
I have check the image sizes and the processed and source images are exact same pixel dimensions.
I tried georeferencing the processed image with four points, then reloading the outputted raster back into georferencer, and loading the original set of GCP's but got same result.