Object clipped to shape/curve at angle show aliasing

[junovhs]

I'm having this recurring issue, where if I clip something to a shape/curve at an angle the original shape/curve fill bleeds into the edge, which is particularly obvious when clipping a light color to a dark color as shown here:

 

Can anybody help?  Much appreciated

clipping mask error.afdesign

[firstdefence]

Make sure you have Precise clipping enabled in Preferences: Performance.

You also have a slight colour shift between the nested colour and the background

[gdenby]

Hi, junovhs,

This is a known problem, and one that is not trivial to do away with in the code.  From what I gather, the anti-aliasing routine picks up a trace of a background color. The work around is to add a centered edge stroke. In your file, if a stroke of the same aqua color is placed on the black shape, the dashed line goes away.

EDIT, and what firstdefence said.

[junovhs]

1 minute ago, firstdefence said:

Make sure you have Precise clipping enabled in preferences: Performance.

You have just saved me so much work and so many headaches it is insane.

THANK YOU

[firstdefence]

[eobet]

On 3/10/2019 at 10:32 PM, firstdefence said:

Make sure you have Precise clipping enabled in Preferences: Performance.

Wow, I was just about to post this as a bug... lucky I found this thread!

What a silly thing to disable by default... although, I've noticed that the app does become quite sluggish quite quickly. Illustrator is always slow, but never bogs down. Designer is fast on small documents, but quickly becomes sluggish.