i found the plugins/imageformats/
for Dynamic dll, i just copy the imageformats dir and its DLL into my own project's bin dir. and i don't copy the Lib files. is it OK? i found that i don't need to link the Lib when i use dynamic link Qt. why? and should i do sth else, or just put the imageformats dir into my own bin dir. for Static lib, i copy the imageformats dir and its lib into my own project's lib dir.
is this all right ?
Did you take a look at Qt's deployment documentation ?
There's also this fine wiki entry