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Re: [PanoToolsNG] Re: Some of you postulate reduction of image size for clarity...

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  • Ken Warner
    Yup. No easy answer. Image content is a huge determinant.
    Message 1 of 13 , Aug 25 4:11 PM
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      Yup. No easy answer. Image content is a huge determinant.

      Erik Krause wrote:
      > Am 25.08.2011 22:18, schrieb Ken Warner:
      >> For practical purposes for web publishing, one can probably use less
      >> than full size images and still have a good looking presentation.
      >> But a hard and fast 70% reduction -- I'm not sure about that.
      >
      > As Sacha wrote: Reduce and enlarge again, overlay with the original,
      > eventually use difference layer mode in photoshop to actually see what
      > has changed. During one of the gigapixel discussions recently someone
      > even wrote a script to do that automatically and determine the smallest
      > size which contains (almost) the same information.
      >
      > However, there never will be the full information, since some is lost.
      > There is no possibility to get it again, no matter how good the
      > interpolation is. Imagine a fine diagonal line which hits the green
      > pixels only. How should a software determine whether it is green or
      > white? The effect is visible as moiré, btw.
      >
      > But there certainly are differences depending on the image content. I'd
      > guess that a mostly black and white image will suffer more from
      > reduction since all sensor pixels potentially contribute while an image
      > that is evenly bright and has only color contrast could possibly be
      > reduced to 50% without loss...
      >
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