Check if inline images are supported

Author: minad

gnuplot.el

@@ -321,7 +321,9 @@ Set VARIABLE to VALUE.  ARGS is optional args."
     (set variable value))
   (gnuplot--setup-comint-for-image-mode))
 
-(defcustom gnuplot-inline-image-mode 'inline
+(defcustom gnuplot-inline-image-mode (and (display-graphic-p)
+                                          (image-type-available-p 'png)
+                                          'inline)
   "Whether to display Gnuplot output in Emacs.
 
 Possible values are nil, `inline' and `dedicated'.