Digital Camera Repair Questions? Ask a Camera Expert.
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I am not sure what you mean by setting a picture size in inches. It is much more usual to have the picture size specified in width and height of pixels (or dots.)
As for pictures turning out blurry - that depends upon
A. camera mode
B. aperture (if not in Auto mode(s) - aperture that is too small makes the exposure longer, which leads to blurriness.)
C. several other minor factors.