Why oh why :) appears to do auto feather

Discussion in 'Photoshop Tutorials' started by CD, Feb 6, 2005.

  1. CD

    CD Guest

    PS7.0
    I can get a simple one layer background and fill it with a solid color.
    Then I do a image resize and I be darn if it does not do about a 1or 2px
    feather on the edges automatically. I can not find where in the heck it is
    getting this setting from?

    Maybe related or not but if I use the marque to make a selection and the
    feather is set to 0 on the tool bar prior to doing the selection it does the
    same thing.

    Novice training needed :)
     
    CD, Feb 6, 2005
    #1
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  2. CD

    edjh Guest

    Check it under Select also. If not set to zero set it (it will not let
    you do zero but will set to 0.2)

    When you resize you resample, thus introducing antialiasing--so that may
    be part of the problem. Not exactly sure what you're doing.
     
    edjh, Feb 6, 2005
    #2
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  3. CD

    Tacit Guest

    I can get a simple one layer background and fill it with a solid color.
    Yes, that is correct. it is not a "feather." This is what happens when you take
    an image made of pixels and resize it.

    When you resize a bunch of pixels, Photoshop has to create all new pixels,
    which it does by looking at the original pixels and "guessing," via a
    mathematical process called "interpolation," what the new pixels should be.

    Sometimes, this process creates pixels that are intermediate in value between
    the original pixels. For example, say you have a red background with a hard,
    sharp-edged green box in the middle. You resize it to two-thirds of the
    original size. Now the green box no longer has sharp edges--because
    mathematically, the new image should have pixels that are one-third green and
    two-thirds red, so Photoshop fills the pixels along the edge of the box with
    pixels that a re a mix of green and red.

    This is part of the reason that you should not resize pixel-based images. Doing
    so will always reduce the quality of the image.

    You have options for the type of mathematical process Photoshop uses to resize
    images; you may find that an option other than the default "bicubic
    interpolation" will help.
     
    Tacit, Feb 7, 2005
    #3
  4. CD

    CD Guest

    Thanks for the info.
    How would you recommend changing sizes?

    I have receieved images that I have to resize to fit the space. They are
    not a vector. The problem was main the background of a when I resized you
    would see a line around the image in the web page. I dont have the option
    to use trans gif in all cases. I thougth for now on, I would resize and the
    add the bkgd color. I did expermeint and yes changin from bicubic did
    resolve BUT what is the best option to use to keep the image as sharp as
    possible?

    Thanks again,
    PS newbie
     
    CD, Feb 8, 2005
    #4
  5. CD

    tacit Guest

    This will vary from image to image; there is no one "best" setting.

    If the background ended up with a fringe on the edge after you resized
    the images (I assume you were resizing down rather than up), the
    background likely wasn't filled 100% to the edge with solid color,
    however.
     
    tacit, Feb 9, 2005
    #5
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