PS6: Feather puzzle

Discussion in 'Photoshop' started by Don, Jun 2, 2004.

  1. Don

    Don Guest

    Version 6.

    I ran some tests by creating two images: one white and one black.
    Next, I selected a small area of one and copied it to the other.

    Now then, without Feather the border between the copied and underlying
    color was solid, as expected, i.e. instant transition from white to
    black.

    However, once I applied Feather the number of affected pixels for the
    transition was not what I expected! For example:

    Feather: 1 - took 6 pixels to go from pure black to pure white
    Feather: 2 - resulted in transition needing 10 pixels
    Feather: 3 - took 14, and so on...

    I would've expected a feather of 1 to take, well... 1 pixel. I could
    also understand if Feather of 1 resulted in a 2-pixel transition: 1 on
    the white side and 1 on the black. But 6!?

    What's going on here?

    Don.
     
    Don, Jun 2, 2004
    #1
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  2. Don

    Don Guest

    Anyone?
     
    Don, Jun 4, 2004
    #2
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  3. Don

    peccavi Guest

    its because of the gaussian bell routine used in calculating the
    feather.Without it the blend would be jaggy.You can count on each unit
    of feather radius taking 2.7 pixels in and 2.7 pixels out from the
    selection .
     
    peccavi, Jun 4, 2004
    #3
  4. Don

    Don Guest

    Excellent! Thank you!

    Don.

     
    Don, Jun 5, 2004
    #4
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