Jean-Francois Roy wrote:
\center{\includegraphics[scale=0.9,angle=0]{graphics/myimage.pdf or myimage.png}}
-- use _no_ extensions for the graphics -- use \centerline{ ... }
\usepackage{graphicx}
always needed, when the graphoics are not inserted by LyX
LaTeX Error: Cannot determine size of graphic in /Users/bahamut/ Documents/Sch...cale=0.9,angle=0]{graphics/Processus.pdf}
only three possible cases: -- you used latex instead of pdflatex -- the image is damaged -- the image path is wrong Herbert