*** /tmp/ediff8MKRAj	2020-12-15 11:48:55.135422232 +0100
--- /home/albinus/src/emacs/lisp/image-mode.el	2020-12-15 11:48:23.287396973 +0100
***************
*** 794,801 ****
      (error "The buffer is not in Image mode"))
    (let* ((filename (buffer-file-name))
  	 (data-p (not (and filename
- 			   (file-readable-p filename)
  			   (not (file-remote-p filename))
  			   (not (buffer-modified-p))
  			   (not (and (boundp 'archive-superior-buffer)
  				     archive-superior-buffer))
--- 794,801 ----
      (error "The buffer is not in Image mode"))
    (let* ((filename (buffer-file-name))
  	 (data-p (not (and filename
  			   (not (file-remote-p filename))
+ 			   (file-readable-p filename)
  			   (not (buffer-modified-p))
  			   (not (and (boundp 'archive-superior-buffer)
  				     archive-superior-buffer))