SETLOCAL ENABLEDELAYEDEXPANSION

SET gravity=-gravity Center
SET Option=-pointsize 200 -background "#00000000" -fill 

FOR /F %%i IN ('convert %Option% white label:"Test" -format %%wx%%h info:') DO ^
FOR /F %%j IN ('convert %1 %gravity% -crop %%i+0+0 -format "%%[fx:(mean<0.5)?1:0]" info:') DO ^
convert foto.jpg %Option% rgb(%%j00%%,%%j00%%,%%j00%%) label:"Molinos del Quijote" %1 -reverse -compose over %gravity% -geometry +0+0 -composite "_xxxx1111.jpg"