A picture with the size of 1024 by 768 pixels is saved as a 256 colour image.?

Answer There's no way you can predict that.You didn't say what format the picture is (jpg, gif, png, bmp)Even if you did, it would be impossible to say

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Can that person on facebook know if I saved her uploaded picture?

No... of course not but it seems like you really like this girl. Maybe you could talk to her about it? :)