gnus-face-properties-alist

gnus-face-properties-alist is a variable defined in `gnus-art.el'.
Its value is

((pbm :face gnus-x-face) (png))

Documentation:
Alist of image types and properties applied to Face and X-Face images.
Here are examples:

;; Specify the altitude of Face images in the From header.
(setq gnus-face-properties-alist
'((pbm . (:face gnus-x-face :ascent 80))
(png . (:ascent 80))))

;; Show Face images as pressed buttons.
(setq gnus-face-properties-alist
'((pbm . (:face gnus-x-face :relief -2))
(png . (:relief -2))))

See the manual for the valid properties for various image types.
Currently, `pbm' is used for X-Face images and `png' is used for Face
images in Emacs. Only the `:face' property is effective on the `xface'
image type in XEmacs if it is built with the libcompface library.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.