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  1. #1
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    Default Image Size Reduction

    When reducing the size of an image from, say 20,000px x 10,000px, to 1000 x 500, is there a quality difference between typing the sizes in the Width and Height on the toolbar vs its toolbar neighbour Scale By Percentage?

    Click image for larger version. 

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  2. #2
    Join Date
    Feb 2007
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    Default Re: Image Size Reduction

    never noticed a quality difference chris, although I use mostly PNG not JPG
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    Nothing lasts forever...

  3. #3
    Join Date
    Apr 2012
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    Default Re: Image Size Reduction

    @Chris, there ought not to be.
    Xara keeps its images unpacked and only applies compression when rendering or exporting.

    Acorn
    Acorn - installed Xara software: Cloud+/Pro+ and most others back through time (to CC's Artworks). Contact for technical remediation/consultancy for your web designs.
    When we provide assistance, your responses are valuable as they benefit the community. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  4. #4
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    Default Re: Image Size Reduction

    @acorn you are more technical than I am

    my understanding is that the render you see in the workspace is not the image itself - altering the view quality being the most obvious example - there may be small rounding issues with the workspace render, and these may differ between the methods, and JPG artifacts may play a part... but non of this affects the actual image [what you said effectively ?]
    -------------------------------
    Nothing lasts forever...

  5. #5
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    Default Re: Image Size Reduction

    Quote Originally Posted by handrawn View Post
    @acorn you are more technical than I am
    my understanding is that the render you see in the workspace is not the image itself - altering the view quality being the most obvious example - there may be small rounding issues with the workspace render, and these may differ between the methods, and JPG artifacts may play a part... but non of this affects the actual image [what you said effectively ?]
    @handrawn, more or less.
    Inputting an actual size or a percentage will only be affecting the numeric calculation not the render.

    @Chris - try this.

    Size and scale to create two "identical" images.
    In the Bitmap gallery, right-click each image and in its Image Properties: Untick Smooth when scaled up.
    Now Zoom in and you will now see individual pixels unsmoothed.

    Easier to make a value judgement.

    Acorn
    Acorn - installed Xara software: Cloud+/Pro+ and most others back through time (to CC's Artworks). Contact for technical remediation/consultancy for your web designs.
    When we provide assistance, your responses are valuable as they benefit the community. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  6. #6
    Join Date
    Dec 2018
    Location
    Australia
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    1,772

    Default Re: Image Size Reduction

    Thank you both. This started with a friend casually talking about reducing images for emailing. He made the comment that reducing by percentage retained the quality of a photo, whereas picking a pre-determined size from the options didn't. He was talking about mobile phones, but it had me wondering.

 

 

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