@ Claude
Merci pour toutes ces explications
Non je ne change rien en RVB, certes photoshop me demande s' il doit modifier automatiquement en ouvrant et je répond non, laisser l'original tel que

Thanks for explanations. I don't change the RVB ... when opening a pic worked with Pf , in
a photoshop window..if photoshop "asked if it has" to convert i answer to let in original work

I hope all understand my english " in live" without translator !!!!  LOL !!