How can I change image resolution ?

I want to make an application :
1: user upload an image
2: he define 2 points, and the program was told the distance
between 2 points to be 5 inches
3: change the resolution of the image to be 125 pixels/inches
any idea?thank you

I managed to write a VI that can reduce the resolution of bitmaps. It was tedious. I would still like a solution that can increase or decrease the resolution.
Attachments:
resize2d.vi ‏50 KB
test_resize2d.vi ‏36 KB

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