Oki pour transformer le psd en png, par contre il n'est pas nécessaire de booter sur classic pour faire la manip...
>Mousaholic-method
You need to logout as user or admin and login again as root.
Go to /System/library/CoreServices
Control-click the item 'Dock' and select 'Show Package Contents' .
Go to /Contents/Resources, make a backup copy of the file "poof.png"
and then drag the new file "yourpoof.png" into
/Contents/Resources.
Rename it to "poof.png"
Restart the dock or login again as user to use the new poof.
>Terminalgeek-method
You will need to have root access or sudo each of these.
su
cd /Volumes/RealPoof/10.2/
cp realpoof.png /System/Library/CoreServices/Dock.app/Contents/Resources/
cd /System/Library/CoreServices/Dock.app/Contents/Resources/
mv poof.png poof-bu.png
mv poof-bu.png ~/Desktop/
mv yourpoof.png poof.png
Restart the dock or login again as user to use the new poof.
La première manip fonctionne sans problème, je n'ai pas essayé la seconde, à vous de voir...