by Julieanne Kost
When working with Layer Masks, the Properties panel can be used to non-destructively soften the edge of the mask enabling it to be re-edited at a later time. This can be very useful if the size of the original file or even layer needs to be changed in the editing process.
To add a non-destructive feather, select the desired layer mask on the Layers panel. Then, on the Properties panel, adjust the Feather slider as needed. Although this feature was in Photoshop CS5 (via the Masks panel), in Photoshop CS6 the Feather values support decimal places.
Note: in Photoshop CS6, the Marquee, and Lasso tool’s feather values (in the Options bar), support decimal places as well.