about nuke alpha

hi guys , long time no see .
i just have a question about nuke alpha .
i try to load the footage(tiff) in nuke .
when i see the footage alpha in shake , it is white

but in nuke ,it is red(in rgb)

and when i choose R ,it is white。

i dont know why ,and if i do my job in red alpha ,what will happen?
thanks!!!
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