Saving Shapes to PNG Causes Jagged Edges

Hello,
I use a Mac and I have Illustrator CS6 and I've noticed something strange. I create shapes using the pentool. When I save the shape to a PNG with a transparent background, it looks smooth, however when I import and resize the shape it pixelates and it has jagged edges. I've attached a screenshot so you can see what I mean.
I'm wondering if it's a setting or something that I don't have turned on (or off). Or perhaps it's something else. I'm curious why this is happening. I’ve turned on the Anit-aliased Artwork and changed the ppi to 300…but to no avail.
Any help would be appreciated…but I’m new to Illustrator and have no idea, so please use detailed and basic instructions that a noob can understand.
Thanks in advance.

peta2005 wrote:
however when I import and resize the shape it pixelates and it has jagged edges.
You answered your own question. A png is a raster image therefore resizing the image will pixelate it.

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Hi Everyone,
I have Illustrator CS6 and I've noticed something odd. Whenever I create shapes they have jagged edges. I've attached a screenshot so you can see this. I'm wondering if it's a setting or something that I don't have turned on (or off). Or perhaps it's something else. I've never noticed jagged edges in Illustrator before so I'm curious why it may be happening now.
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Doug,
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You may enjoy how the (slight) jaggedness becomes relatively smaller as you zoom in; that is an obvious way of determinning whether you have vector or raster artwork.
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I'm creating objects in illustrator (CMYK, 300dpi) for print purposes and the thing that bothers me is the jagged edges with a light pink color between the fill and stroke of the shape (see image) at any zoom level.
This shape, created in Illustrator, is being imported into a Photoshop collage at the same resolution on a dark grey background, where the jagged edges become even more striking.
Will this look as it should when it comes out of printing house? I know there's a difference between shape handling in Ai and Ps because of the different output media for each another...but still the screen appearance is disturbing.

function(){return A.apply(null,[this].concat($A(arguments)))}
I'm creating objects in illustrator (CMYK, 300dpi) for print purposes and the thing that bothers me is the jagged edges with a light pink color between the fill and stroke of the shape (see image) at any zoom level.
I'll assume your screenshot is from Illustrator, not from Photoshop after importing the AI elements. That is, I'll assume that both the red shape and the black shape are native to Illustrator, both are vector paths with ordinary fills applied (no raster-based effects), and you want to bring both of them into Photoshop. The undesirable "light pink" is what you're seeing in Illustrator.
First, understand that in Illustrator you are not creating pixels. You're creating paths. Paths are mathematically-defined curves. You apply fills, which are just another kind of command, not pixels. Now...as you work in Illustrator, Illustrator has to display what you are creating on your monitor as pixels, even though what it's creating are not pixels. In other words, it's "printing" the mathematical shapes to your monitor. Your monitor is acting as the "printer." The monitor has pixels, but your objects (the paths) don't.
By default, Illustrator "prints" to your monitor using an algorithm called anti-aliasing, which is just a routine that disguises the inhernent jaggedness of the large, crude monitor pixels in order to make the on-screen appearance smoother.
You can turn that anti-aliasing behavior off in Illustrator's preferences. Turn it off and you'll see the edge between the black and red objects become more jagged, but the pink goes away. The degree of jaggedness will stay the same regardless of zoom, because the jaggedness you're seeing is the physical jaggedness of the pixels of the output device (your monitor).
Well, the same principle applies to anti-aliasing. You say the undesirable light pink along the edges occurs "at any zoom". (Again, I'll assume you're doing the zooming in Illustrator, not Photoshop.) So if you have antialiasing turned on, and if you zoom in alot, you still see the unwanted pink edge. But now ask yourself: Does the pink edge actually grow larger as I zoom in? If it doesn't, it's not "real"; it's just the result of the anti-aliasing routine that Illustrator is using when it "prints" to your monitor.
Further, you already know that you have not created any pink objects, right? So the unwanted pink edge is just an anti-aliasing artifact when viewing the artwork in Illustrator on your monitor. That is, since you haven't created any pink objects, there won't be any pink objects when you save the Illustrator file.
Now...all the above applies while working in Illustrator. Read on...
function(){return A.apply(null,[this].concat($A(arguments)))}
This shape, created in Illustrator, is being imported into a Photoshop collage at the same resolution on a dark grey background, where the jagged edges become even more striking.
The artwork is "being imported" into Photoshop how? If you paste or import the vector artwork into Photoshop, it is going to be rasterized (converted to pixels). If you export the artwork from Illustrator to a raster image, it is going to be rasterized. Either way, somewhere along you are going to be presented an option to let you choose whether the imported or exported vector paths use anti-aliasing when that rasterization occurs. If you choose to apply anti-aliasing during the export or import, then yes those pink pixels are going to actually exist in the resulting raster image. However, the degree to which they are visible will depend on the size of the pixels relative to the scale at which they are printed.
So again, ask yourself the same question, but this time, in the context of Photoshop: When I zoom in alot (in Photoshop), does the unwanted pink edge grow larger? If it does, it's real pixels, and yes, it will print. But again, how visible it will be in print depends on printing scale.
Understand also: Such edges are not necessarily undesirable. In raster imaging, one often goes to great lengths to add such "edges" between adjacent pixels of different color. That's essentially what sharpening does. Sharpening actually alters the colors of adjacent differently-colored pixels so as to increase their difference. In the case of any color against black (since black can't get darker), this would result in an "edge" of pixels that are lighter than the non-black color.
function(){return A.apply(null,[this].concat($A(arguments)))}
Will this look as it should when it comes out of printing house?
That's where you have to define "as it should". When you rasterize the vector objects into another raster image in Photoshop, it all ultimately becomes one raster image. Zoom in and see if the pink pixels are actually there.
function(){return A.apply(null,[this].concat($A(arguments)))}
I know there's a difference between shape handling in Ai and Ps because of the different output media for each another
That doesn't make sense. If this is something that you know, you need to find a better way to state it.
function(){return A.apply(null,[this].concat($A(arguments)))}
...but still the screen appearance is disturbing.
On-screen appearance is always disturbing. Anti-aliasing is just one flavor of disturbance. Color accuracy is another. The fact is, a monitor is a very very different kind of output device from a printing press, and the two are never going to look the same. That's why the answer to whether it prints "as it should" lies in the printed results, and that's where you have to look for the answer. But if you send a raster image to a printer, if the unwanted pink pixels are actually there in the image file, then yes, they will print. You can determine whether they actually exist in the final raster image by examining it in Photoshop.
JET

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I'm creating a button logo in Fireworks for print use and
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I'm working in CMYK at 300DPI.
So I start out with a white vector circle for the outer-ring
to the button using an Anti-Alias edge:
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alex
thedrumdoctor wrote:
>
quote:
Originally posted by:
Newsgroup User
> thedrumdoctor wrote:
> > I tried the an export as a 24 Bit PNG and the edges
remaind jagged.
> >
> > I tried the same experiment in Photoshop with the
Vectors shapes there and
> the edges were perfect. Looks like Photoshop wins!
>
> Not sure what I am doing differently. I created a 300
dpi image in FW,
> drew the circle, filled it with blue and added a soft
bevel. No jagged
> edges. At 100% magnification things look fine on screen.
>
> Did similar in PS and got a very similar result,
although the bevel is a
> bit smoother.
>
> Are you referring to printed work, or screen work?
>
> Would really appreciate seeing the original png and
samples of the
> Photoshop vs Fireworks end results. If it's a
reproducible issue, it
> should be reported as a bug for future releases.
>
> --
> Jim Babbage - .:Community MX:. & .:Adobe Community
Expert:.
>
http://www.communityMX.com/
> CommunityMX - Free Resources:
>
http://www.communitymx.com/free.cfm
> ---
> .:Adobe Community Expert for Fireworks:.
> Adobe Community Expert
>
http://tinyurl.com/2a7dyp
> ---
> See my work on Flickr
>
http://www.flickr.com/photos/jim_babbage/
>
>
>
> Well, I've repeated the exercise with a new png file and
uploaded it here
>
http://www.nlauro.f9.co.uk/images/test.vector.circles.png
>
> As you can see, the edges are still jagged on the blue
circle. You can
> download this and see for yourself anyway.
>
> This was done in Fireworks MX so I'm not using the
latest release of Fireworks.
>
> The shape was eventually destined for print work by the
way. As much as I
> don't like the clumsy way PS forces you to create vector
shapes, it produced a
> near perfect smooth edge on the same experiment.
>

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Hmm.
How's this?
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