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For lower-resolution images, such as footwear impressions or tiretread impressions,
the amount of blending is based upon the size of the area selected rather than
the calibrated image resolution. Unfortunately there is not as clear cut
a recommendation for these types of images as there is for smaller items, such
as fingerprints, questioned documents, firearms, etc. When feathering a
selection for low-resolution items, it is recommended that you use a feather
radius that is between 50 pixels and 100 pixels. Use a feather radius
that is closer to the top end of the range when blending a selection with a
lower resolution and a larger selection; use a feather radius that is closer to
the bottom end of the range when blending a selection with a higher resolution
and a smaller selection. If an edge becomes visible after you have
enhanced the selected area, step backwards (Ctrl + Alt + Z) to undo the last
enhancement, then increase the feather radius and repeat the enhancement
process.
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