Does Font Smoothing smooth images too?

Discussion in 'macOS' started by doug in albq, Jan 16, 2008.

  1. doug in albq Suspended

    doug in albq

    Oct 12, 2007
    Or is something else doing this?

    When I open a jpg in Preview app (10.4.11) i can notice for a split second the image is sharper. Then, what seems to be a slight blur or smoothing of the image takes place.

    Does anyone know why this happens.

    Is it a product of the jpg itself saving some type of image smoothing (I usually set this to none, or 0, when saving said jpg's from Gimp).

    Could this simply be the OS itself applying some system-wide graphics smoothing?


    (August 2007 20 inch iMac Ati 2400xt graphic card)
  2. Makosuke macrumors 603

    Aug 15, 2001
    The Cool Part of CA, USA
    What you're seeing in Preview is unrelated to Font Smoothing.

    When you open an image at anything but the "native" resolution--that is, 1 pixel onscreen = one pixel of the image--the computer needs to do SOMETHING to adjust it.

    Most apps do a form of interpolation to either make images being displayed at larger than native resolutions blurrier but smoother, or ones that are being shrunk look smoother.

    Preview shows you a completely un-antialiased version for a moment before it does its routine. It can look worse (if the image is being scaled up) or sharper (if shrunk), but at most sizes it will be crisper but "grainer." Photoshop always does the grainy version, to preserve colors, but to most end users with most images the smoother version looks better.

    I don't think you can turn this off, but you can just display the image at the native size (View --> Actual Size or Command-0), which will look as crisp as possible. Alternately, find a different image viewer whose scaling routine you prefer.
  3. doug in albq thread starter Suspended

    doug in albq

    Oct 12, 2007

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