Unwanted "micro" border with overlapping shapes

[ernesto94]

Hi. I'm struggling with this problem: whenever I have perfectly overlapping shapes, I can see a very tiny black border belonging to the bottom one (none of the shapes have a stroke). Here a clear example: I create a black circle with no stroke and duplicate it, making the second one white. I attach the result.

Thanks

ER

[firstdefence]

This happens in Illustrator as well.

 

There is a good explanation of this effect for Illustrator and I think this is what is happening here.

Quote

Adobe Illustrator constructs objects with vector mathematics. However, it has to interpret that vector data into pixels in order to display it on the (pixel-based) monitor.

To create smooth lines on screen it anti-aliases pixels when two colors lie next to each other. It essentially "blends" the two colors together over a pixel or two in order to represent their position. 

Sometimes this anti-aliasing isn't entirely smooth if your monitor is not capable of high quality rendering. Therefore you get a small, off-color, hairline, edge with some objects.

This hairline will generally disappear if you uncheck Anti-Alias Artwork in the preferences. It will also disappear if you print the artwork or export artwork using the "Art Optimized" anti-alias setting.

This small anti-aliasing pixel is generally nothing to be concerned about.

 

[firstdefence]

How to make the fringing go away

[ernesto94]

Hi, thank you very much for the exhaustive answer.

I've tried it and it worked. The aliasing is a bit more pronounced though (I attach an example.)

The software knows what shapes are on top and what ones lie perfectly under them, so I think an option should be implemented to optimize this issue, at least during exportation. (i.e by preventing any pixel to appear if it belongs to the bottom layer).

 

 

[R C-R]

Maybe a dumb question, but if you have perfectly overlapping shapes, why not just hide (or delete) the bottom one?

[ernesto94]

Well, sometimes this could be an option, but not always. For example with shapes that overlap only partially.

[lepr]

.

[ernesto94]

Thank you very much for your answer! I'm going to use this trick.

Anyway, I still think they should implement a more direct way to avoid this unpleasant issue.

 

[firstdefence]

On the 1600% @ 6.25% I can still see the circle!

Does this qualify me to call myself Clarke Kent and wear very very snug red underpants in public.

[R C-R]

2 hours ago, firstdefence said:

Does this qualify me to call myself Clarke Kent and wear very very snug red underpants in public.

No, nothing qualifies you for that. 

[firstdefence]

2 hours ago, R C-R said:

No, nothing qualifies you for that. 

Damn, so close. Okay I'll put my Spiderman outfit back on sigh!