Presharpening:
These actions will allow for a very subtle sharpening that is designed
to counteract the anti aliasing filter from your camera and to give you
a photograph that is ready for creative sharpening and output sharpening.
The presharpening process should be done first before
any
color corrections etc.
it should also be done at the native resolution of the photograph.
there are basically three options here high, medium and low frequency,
what these mean is the amount of and more importantly
the size of the details that are in your photograph.
Example of a photograph that would need high frequency presharpening:
