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Photoshop: How do you make a blur not go over a layer under it without changing the layers level???

I remeber doing this on Photoshop but I can't remeber how to do it or I just did it a different way and forgot but I have looked every where and kind find anything about this.

example

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  • Hi Ashley and welcome to GDSE. I don't fully understand your question. Please elaborate a little bit. "Blur" is normally an effect. Is it the dark lines you are calling "a blur"? Are they just on a normal layer? Does "without changing the layer levels" mean that you won't move the layers? If so then why? Please post an image of your Layers panel. Do you perhaps want to confine the lines to only be on top of the light square? Or do you want the light square to be unaffected by the lines?
    – Wolff
    Mar 29 '20 at 16:39
  • I don't want to change the layers but I want to confine the blur(which is the darker lines) to the shape so that they don't go over the shape. Mar 29 '20 at 19:50
  • So no lines on the light square? Why can't you just move the white square above the lines?
    – Wolff
    Mar 29 '20 at 20:03
  • I want the blur inside the square I just don't want the blur to go outside of the square Mar 29 '20 at 20:14
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    .. add a layer mask....
    – Scott
    Mar 29 '20 at 20:50
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I don't know exactly how your document is set up. If the light square is on a separate layer and has transparent background, you could do one of the following two things:

Create a Clipping Mask

  • Place the mouse cursor between the layer with the lines and the layer with the square which you want to confine the lines to.
  • Hold down Alt and left click.

Create a Layer Mask

  • Hold down Ctrl / Cmd and left click the layer with the square to select all non-transparent pixels of that layer.
  • Select the layer with the lines and click the Add layer mask button.

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