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Here's what I did in Illustrator CC 2015:

  1. Typed a letter i
  2. Clicked Create outlines
  3. Selected the circle and below part of shape and clicked Make compound path
  4. Copied the whole shape and placed at some distance
  5. And tried 3 different shades (Black - Black, Black - grey, Black - White) of color on 2nd shape for smooth blend and here's what I got:

Now, I don't understand why 1st experiment acted as if I selected blend steps? Also, why did it kept making it more smoother as I changed shade from Dark black to white?

Finally, even it looks like I achieved my result in Black - White case, but if you zoom in, it is also not completely smooth from bottom edge as compared to top edge. How can I fix it?

enter image description here

  • You may find it more logical if you think of blend meaning interpolate... or then not. – joojaa Sep 16 '17 at 6:54
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By default, Illustrator's Blend is set to Smooth Color. This creates a blend between the color of the first object and the color of the last object.

If there is no color variation, Illustrator's Blend default to Specified Steps.

So to answer.. black to black is a specified Steps blend. Black to any other color is a smooth color blend. You can alter this setting by selecting the blend object and choosing Object > Blend > Blend Options.

Regarding the edges - Blends are essentially a way to iterate between two or more shapes, creating a copy based on X% of shape 1 and X% of shape 2. Blends never create a "smooth" edge. Blends create copies and just like manual copies, some things like square corners on an angle will always create a "stair step" appearance. You can diminish that stair-step by increasing the number of steps, but it will never really be fully gone.

  • I've seen some online videos where the use Smooth blend from Dark black to Dark black and it works like a charm! For example, see this video from 06:00 to 08:00 (youtube.com/watch?v=Tm3ugB0vj-k&t=477s) What do you say about this? – Vikas Sep 16 '17 at 15:08
  • @VikasKumar still teh same thing – joojaa Sep 16 '17 at 17:37
  • @joojaa how can it be same? The guy got smooth blend using same shades of black. – Vikas Sep 16 '17 at 18:42
  • @VikasKumar Transparency is color to blend. Anyway its this is the way it works like it or not. – joojaa Sep 16 '17 at 18:58
  • Sorry for delayed accept. I didn't know things much at that time. – Vikas Jun 14 at 16:05
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Blending from black to exact black with smooth color seemingly doesn't work. If you still want it, try as a workaround 3D effect Extrude. It can give to you even more, if you use some else shape color than black. See the following examples:

enter image description here

Even full black shapes can have shading if another shading color is selected than black (=default).

Another workaround is to have blending option specified step or specified distance selected. If you have distance = 1 pixel, you probably get at least onscreen smooth blending. The number of intermediate objects can be hundreds, but if the objects are simple, there probably is no fatal slowdown.

The following example is a flat shape that has a modern long shadow. There are 2 versions. In the upper one the shadow is a blend from solid black to fully transparent black. It a little resembles a shaded extrusion. The blending is made with specified step = 1 pixel.

The lower has a 3D extrusion which is expanded, united to one shape and filled with a gradient from solid black to fully transparent black. There's no shading to keep the result flat.

enter image description here

3D doesn't generate that much copies of an object. After expanding and uniting there are only 2 perfectly flat objects (i body and the dot).Unforunately the expanded extrusion often needs some tweaking to make it fit with the original flat shape, because the profile is skewed in the extrusion.

  • I've seen some online videos where the use Smooth blend from Dark black to Dark black and it works like a charm! For example, see this video from 06:00 to 08:00 (youtube.com/watch?v=Tm3ugB0vj-k&t=477s) What do you say about this? And basically I don't want to use 3D. If you see video, I just want to do that. – Vikas Sep 16 '17 at 15:08
  • @VikasKumar There's used blending option "Specified step". Step = 1 pixel. It's not perfect, but looks out quite smooth onscreen. The amount of generated intermediate objects is huge. See my edited answer. – user287001 Sep 16 '17 at 19:17

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