How Is Feathering Applied in PS 7?

CP
Posted By
Cleveland_Park
Jul 29, 2006
Views
210
Replies
4
Status
Closed
I’ve often wondered about how PS applies feathering to a selection. For example, assuming I’ve made a selection and chose a feathering amount of 10 pixels, which of the following methods are used?

1. The 10 pixels is applied inside of the selection boundary.
2. The 10 pixels is applied outside of the selection boundary.
3. 10 pixels is applied to both inside and outside of the selection boundary.
4. 5 pixels is applied to each side of the selection boundary.
5. PS uses a different method not listed above.

One additional question, if I may. If you have a feathered selection, is there a way to un-feather it other than undo or editing the history state?

Thank you.
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JS
Jeff_Schewe
Jul 29, 2006
Feather uses Gaussian Blur so the answer is 4, more or less…you can see exactly what feather does by going from an unfeathered selection to Quick Mask and apply a G-blur…and no, you can not exactly undo a feather or G-blur although you can modify them.
GA
George_Austin
Jul 30, 2006
The 10 pixels you have chosen is the feather RADIUS—the distance it takes for the opacity to fall from 50% at the marching ants selection bondary to 1/e outwardly and to rise the same amount inwardly. At a distance of 2.7 radii inward the opacity has risen to 100% (digital accuracy) and at 2.7 radii outwardly to 0% opacity. The total zone affected is thus 5.4 radii.
DM
dave_milbut
Jul 30, 2006
I love both those answers!!! 🙂 Great job guys!
CP
Cleveland_Park
Jul 30, 2006
Thank you very much for the great explanations!!!

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