The Engineering Projects

I want to add a white frame with one Pixel thickness to a picture in order to separate particles from the image border. I need a gradient completely surrounding each particle, which isn't the case if they touch the image border.

I made a VI which reads an Image, and then makes an array filled with zeros in the dimensions of the picture plus two in each dimension. Then I convert that array into a picture which is two pixels bigger in x and y each than the input picture, and completely white.
Then I copy the first picture in the white one, with an offset of 1;1. This VI should put a white Frame onto my picture which it doesnt. Can somebody tell me what I did wrong?

Thanks for any help.

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