With the export fonction : the DPI value is not writen in the picture ; always 96ppp.
For the dpi value considered, I have to do "save as".
PLEASE... add DPI in the export methode.
And (it's free) why isn't there any good guy to correct all the mistake about definition and correction in the french texte !!!!!!

pixels are a définition ; not a resolution (in french in any case)
thanks.