: Transparency in clipping mask groups I am using a clipping mask to cut out some shapes. These shapes are composed of a rectangular "base color" and then some extra shapes overlaid for shading.

@Dunderdale640

A clipping mask might be the long way around. Try using the compound path for all fills.

Start with your base layer (fill color).

Then copy and paste in front (CMD-F on Mac) fill with your gradient and adjust the transparency. This might give you the desired result without the headache of the thin lines.

If that fixes the problem, make sure you group them afterwards to ensure that they are being moved together.

As a rule (for me) I don't use clipping masks unless I am using rastered images. There are way more ways to create a vector without mucking up the process by putting it in a Clipping Mask. Use the Pathfinder tool as much as you can but be sure you are "Expanding" the vector.

If this option doesn't help with your issue. Try "Flatten Transparency" under object, although the above should give the desired result.

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@Reiling762

This colored-edge effect can't be removed. Actually, there are two layers with the same mask, and illustrator rendering engine use approximation methods, that can't detect identical curves.

That is why white object placed behind identical black object gives a tiny line.

Render artwork in higher resolution, then downscale it.

p.s. Rendering in PNG gives very good results. Maybe, there are optimized algorithms triggered.

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