I have successfully georeferenced a UAV-generated image (4-band) using the georeferencing toolbar (using the Update Georeferencing option to create a world file). I saved my link table. A colleague had generated a classification from the original (ungeoreferenced) image. It has the same number of rows and columns, but pixel values are different and it has only one band (not four). I want to georectify this image in the exact same way using the same control points and the exact projected coordinate system. However, when I try to apply the control points to this new derivative layer, I get collinearity issues and the two images do not line up at all.
I would think that they're practically the exact same image-- why wouldn't control points from the first image work to register the second image? I did notice that when the images were brought into ArcGIS in their unregistered state, their extents do not match (see attached screenshot). Any idea of a work-around for this? Or do I manually have to georectify the second image?