Hi Steve,
Make sure the option "Assume background is a plane" is disabled in the Multi-Aperture set up panel. If that is enable, this message will be displayed when the mouse cursor passes through a region of constant pixel values (like the white regions outside an image).
I plan to disable this message in the next release (it's been there in all versions so far).
Karen
On 6/19/2019 11:16 PM, stevesmith [via AstroImageJ] wrote:
Just upgraded to AIJ 3.3.1. When we open images, the log says "Photometric ERROR: cannot fit plane to background, using average background instead".
Steve S.