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  1. #1
    Regular Coder cineweekly.com's Avatar
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    Photoshop: Resizing Images (shrinking) Causes Transparency

    Why, when shrinking images, does the outermost pixel (not always all edges) become semi transparent? I figured some sort of aliasing thing but can't solve it. I can usually figure out Photoshop since I've been using it for nearly 13 years but I can't pinpoint this.



    I don't think it happens when resampling "bilinear" but I don't like that option.

  • #2
    Regular Coder cineweekly.com's Avatar
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    So does anyone know what's causing this and how to prevent it?

  • #3
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    I never noticed it until you posted. But your right, I zoomed in to 800% and there it was. I guess it's some sort of artifact from the resizing algo, I don't have a clue.

    I haven't run across any other posts about it, it's pretty unnoticeable unless it's pointed out, I guess that's why.

    Does it mess with your image composting at all?

  • #4
    Regular Coder cineweekly.com's Avatar
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    It's noticeable for my site because I use a dark background and this causes a light border that makes the images stand out when I don't want them to. I have to add a black background layer underneath or crop out a pixel layer. It's just an unnecessary step that I'd like to avoid.

  • #5
    The Apostate Apostropartheid's Avatar
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    This happens when the image is not snapped to the nearest pixel. This is the smallest measurement possible, so Photoshop makes it semi-transparent to give the illusion it's midway between the pixels.

  • #6
    Regular Coder gcmax's Avatar
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    No, the reason is image interpolation, here is the remedy;

    Go to edit, preferences, general and then change the "Image Interpolation:" dropdown to "Nearest Neighbour (preserve hard edges)".

    Now you will find that image resizing and free transforming will be free of this phenomena.

  • #7
    Regular Coder cineweekly.com's Avatar
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    Quote Originally Posted by gcmax View Post
    No, the reason is image interpolation, here is the remedy;

    Go to edit, preferences, general and then change the "Image Interpolation:" dropdown to "Nearest Neighbour (preserve hard edges)".

    Now you will find that image resizing and free transforming will be free of this phenomena.
    I've tried all the other resampling methods but they don't help. "Nearest Neighbor" has always been the worst except when working with 8-bit style graphics like video game sprites.

  • #8
    Regular Coder gcmax's Avatar
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    Quote Originally Posted by cineweekly.com View Post
    I've tried all the other resampling methods but they don't help. "Nearest Neighbor" has always been the worst except when working with 8-bit style graphics like video game sprites.
    Does what it says on the tin and preserves the edges of an image, it's not something I use as nearly all of my work involves size reduction so I choose the Bicubic Sharper option which provides sharper anti-aliasing.

    There's an article here which is an interesting read: http://www.cambridgeincolour.com/tut...erpolation.htm

  • #9
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    i also experience this. what i do is export on Ai (adobe illustrator) and resize, export back to photoshop.

  • #10
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    Hi i am Ana Taylor n i m new here,
    anybody want to teach my? Photoshop :

  • #11
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    Quote Originally Posted by imanaseo View Post
    Hi i am Ana Taylor n i m new here,
    anybody want to teach my? Photoshop :
    There are thousands of Photoshop tutorials online. Adobe has many as well as other sites. Just Google for what topic you wish to learn as it is hard to "teach" someone via a post.
    ☠ ☠RON☠ ☠


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