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Following this great tutorial by Gigantic about creating "grainy gradient", I face a problem after masking.

I have two layers: 1st one is the object itself which is a [Rectangle] and another Group including paths. As mentioned in the video, I select the group, then in the "Transparency Panel" I create a mask and then copy the object in the black box. Everything works well except the opacity of brush paths. I'm not sure if it's related to the brush or is a bug - maybe. I don't have this problem with general brushes.

Ticking "Invert Mask" helps a little, but the opacity isn't still 100%.

I'm using Spoon Graphics Stipple Shading brushes from the free bundle.

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  • By the way you would get a lighter scene if you used a clipping mask instead. And also you will have less elements in your scene if you later fill the clipping mask yoth your bg color
    – joojaa
    Sep 6, 2019 at 17:21

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(Didn't watch the video)

For Opacity Masks (which is what you've described) to mask everything entirely you need to ensure the black you are using is 100C/100M/100Y/100K or 0R/0G/0B -- all channels need to be solid on the mask. Basically, use the "Registration" swatch.

If you simply use 100% K in areas on the mask, they will be a dark grey and not fully mask everything.

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