Variable: image-transform-scale
image-transform-scale is a buffer-local variable defined in
image-mode.el.gz.
Documentation
The scale factor of the image being displayed.
Probably introduced at or before Emacs version 27.1.
Source Code
;; Defined in /usr/src/emacs/lisp/image-mode.el.gz
(defvar-local image-transform-scale 1.0
"The scale factor of the image being displayed.")