Hi Jean-luc...

Welcome to the board, hope you get something out of it. [img]/infopop/emoticons/icon_wink.gif[/img]

Ok first off... even when you do save an Alpha Channel with a tif, you will not see any obvious transparency when just viewing the image with a normal viewer program.

The alpha channel info is embedded in the file and only used by programs that can read & understand how to use it. Otherwise... it's just a normal image like any other.

Try this and see if it changes anything for you when you go to save out your Tif:

Open the EDIT menu and then the Prefs menu. In there, flip through the tabs, you'll see an option to "Save Tifs with advanced options". Make sure that is ticked ON.

See if that helps in any way. Then let us know ok.

PS: When your print house goes to print the image, their graphics software should be able to detect and use the embedded Alpha Channel info. If not, they need to get better software. [img]/infopop/emoticons/icon_rolleyes.gif[/img]