how to do a radial expansion / scaling ?

Discussion in 'Photoshop Tutorials' started by Guillaume Rava, Mar 4, 2004.

  1. Hi,
    I am trying to rescale a picture with a higher scaling factor towards
    the edges of the picture - any idea how to do that?

    As for example, imagine a picture in the shape of a donut. I want to
    expand the donut, but keep the same radius for the inner circle of the
    donut. This radial scaling would expand the picture more as you go
    towards the outer edge of the donut, but would preserve the scale at
    the inner edge.


    Thanks,
    Guillaume.
     
    Guillaume Rava, Mar 4, 2004
    #1
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  2. You could try a "Displace" filter.
    Depending on the size, you could also look at the "Liquify" filter.

    Bart
     
    Bart van der Wolf, Mar 4, 2004
    #2
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  3. Guillaume Rava

    mxduffie Guest

    Hmm...would there be a way to apply a circularly linear liquify?

    How about the distort filter. Enlarge overly large to accommodate the
    outside diameter and then distort to shrink the center? Sorry, I'm not
    fluent in all of those operations and can't bring it up to experiment
    right now, but I know what I'm trying to say. The filter I'm thinking
    of shows a distorted grid.

    gm
     
    mxduffie, Mar 4, 2004
    #3
  4. Guillaume Rava

    RTM Guest

    Try the 'Polar Co-ordinates' filter.
     
    RTM, Mar 4, 2004
    #4
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