I've got a problem with masking. I've made an object and masked it over. The masking effect is visible, but it should go behind the object. The transparent part should be at 0% visibility, but somehow it's still visible and I'm not sure why. How do I fully hide this part of the object?

enter image description here

  • Is your mask 100% opaque?
    – AAGD
    Dec 7, 2015 at 19:07
  • what that mean? Dec 7, 2015 at 19:08
  • 1
    in your screenshot, the blue path is selected (orange border). the settings relate to it. if you would click on the black mask you could see the mask opacity.
    – AAGD
    Dec 7, 2015 at 19:10
  • Yes @Vincent that was it, didn't know about that. Thank you both now it's working :) Dec 7, 2015 at 19:29

2 Answers 2


Either your mask opacity is not 100% or the colour you use isn't fully black.

Especially if you work in RGB and you chose the standard black swatch, it is possible that it is instead a very dark gray (actually CMYK black), which translates to barely but still visible in masking.

Change the colour of the masking black object to actual RGB (0,0,0). If that doesn't work, check your mask opacity.


I don't think it has anything to do with the mask itself. The yellow (label?) kind of thing, is it a linked or placed object? Check in Photoshop the transparency, it probably is set to 90% percent or so, or the Photoshop mask is a bit shimmy.

  • 1
    Hi Captain, welcome to GDSE and thanks for your answer. As you can see from the question title, the poster is using Illustrator, not Photoshop. Additionally, they included a screenshot where you can see the opacity is at 100%. Please try to improve your answer or remove it if you feel like it's no longer required. If you have any questions, please see the help center or ping one of us in the Graphic Design Chat once your reputation is sufficient (20). Keep contributing and enjoy the site!
    – PieBie
    Dec 8, 2015 at 8:02
  • Hi there, I get your point, but do not totally agree; the pixels in the screenshot tell me there is a placed or linked object on the illustrator canvas, the orange plane. On top of that a blue line and several other strokes have been drawn in Illustrator. The opacity in Illustrator might be set to 100% but when the placed object is (semi)transparent, it is visible in Illustrator as well. A well, I was just passing by.. Cheers, Flo Dec 14, 2015 at 8:10

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