Enlarge section of photo - must be 300 dpi.

I have a 300 dpi photo and want to enlarge a small section of
the photo - it has to be 300 dpi after enlarging and have
an output of 8 inches.
how do i do this?
deb

Basically
# Crop the image
# Export the version ( File->Export->Version )
# In the *Export Preset* pulldown select edit.
# In the Image Export window select 300 dpi
# In the *Size To:* pulldown select *Fit Within Inches*
# Enter the dimensions
# Export
Having said all that the final quality of the image will depend on the original size you have to work with.

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