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Thread: Elements - the five down-sampling methods compared

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    xpatUSA's Avatar
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    Elements - the five down-sampling methods compared

    I used a really fancy Siemens Star target image, created by Bart van der Wolf, see here (huge file). It was for lens testing but, 3685 pixels square, seemed ideal for testing re-sampling methods such as bicubic, bilinear, etc. The big file was re-sized from 3685px to 640px for the test. No photographs were involved and no animals were harmed.

    Without further ado:

    Elements - the five down-sampling methods compared

    Elements - the five down-sampling methods compared

    Elements - the five down-sampling methods compared

    Elements - the five down-sampling methods compared

    It certainly brings out the aliasing caused by the nearest neighbor algorithm!

    In the end, I preferred bilinear in PSE 6 but lately have started to use Lanczos3 in another editor.

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    xpatUSA's Avatar
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    Re: The other Editor - Bilinear vs. Lanczos

    Quote Originally Posted by xpatUSA View Post
    In the end, I preferred bilinear in PSE 6 but lately have started to use Lanczos3 in another editor.
    Here's a Real World scene at 23% reduction, Lanzcos on right:

    Elements - the five down-sampling methods compared

    Unlike patterned target comparisons, the differences are less obvious but, none-the-less, are discernible to the critical eye. At right, a reduction in moiré on the ribbed insulators especially the inverted chevron artifact on the vertical one. A slight improvement in contrast, see the shadow on the pole.

    Not a lot of difference in the Real World but possibly enough to avoid a rejection due to aliasing on a wedding dress or a model's hair?

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