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Can anyone help in making this clipping mask?

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  • Can anyone help in making this clipping mask?

    I know a clipping mask lets you keep what is overlapping, but how do you keep the difference? For example, on the attached screenshot, how would I keep the red part of the ellipse? Any suggestions would be greatly appreciated.
    Attached Files

  • #2
    Re: Can anyone help in making this clipping mask?

    Copy the blue channel and adjust to make the blue area white and the red area black; I used curves.

    On the layers palette, double click the background layer to unlock it, cntl+click the new alpha channel, invert the selection and make it a mask.

    The mask might need a touch-up with the burn/dodge tool to tidy it up.
    Attached Files


    • #3
      Re: Can anyone help in making this clipping mask?

      Sorry, maybe I should've been a little more specific. I'm using Illustrator to try to get this shape. I need to actually cut it out so I can layer something under it.


      • #4
        Re: Can anyone help in making this clipping mask?

        It's been a long time since I've used Illustrator, but there's a palette with shapes on it, one of which is unite (not the one you want). There should be one called something like divide or cut. Highlight the 2 shapes, click and delete the parts you don't want.

        IIRC there's also a dropdown list with the commands: add/subtract foreground/background.

        Make a copy of the file and have a play around.


        • #5
          Re: Can anyone help in making this clipping mask?

          Got it! In the Effect menu, there's an option called Pathfinder>Subtract. When shapes are grouped, it subtracts whatever is overlapping.


          • #6
            Re: Can anyone help in making this clipping mask?

            That's the one! Couldn't remember, too near bedtime.


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