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I have vector artwork that is not aligned to a pixel grid in Illustrator. In CS5, I would be able to paste the vector object as a smart object into Photoshop file that was larger than the illustrator image and resize larger while holding shift to keep the ratio the same.

However with Creative Cloud, if I have a square in Illustrator that happens to be 17.3px by 17.3, then paste to Photoshop in a file that has a larger canvas than the paste, I get uneven horizontal and vertical ratios (width = 18; height = 17). It seems to overestimate the width and make it appear fatter horizontally (which is the wrong aspect ratio). This is very noticeable when vector objects (like perfect circles and small icons) get scaled up in Photoshop.

I have tried unchecking and checking "Snap Vector Tools and transforms to Pixel Grid" but this doesn't seem to fix it.

The only way I've been able to get this ratio to be kept is to create a new document with the size automatically changed to clipboard dimensions (which are the desired 17x17). When you paste as smart object, it now uses the correct aspect ratio.

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Is the pixel aspect ratio of the PS file set correctly? I've never even heard of this issue. –  Scott Nov 15 '13 at 22:04
    
A pixel is atomic in nature so it must be rounded to an integer in a raster program: it seems like you want the rounding to be uniform...what happens to the smaller square if you make a 20px square, place the 17.3px square on top of it so that it is contained by the larger square, group it and then paste it? –  horatio Nov 15 '13 at 22:09
    
@horatio, Pasting a group with the outer shape being an even pixel paste as expected (the 17.3 pixel shows anti-aliasing, but it even). I realize that Photoshop CC is rounding to a non-exact pixel dimension, but this behavior of not maintaining ratio when pasted and enlarged worked in earlier Illustrator/Photoshop versions (CS5 on Mac). –  ekloff Nov 15 '13 at 22:31
    
@Scott, the PS file is 72ppi, just an ordinary 800x600 document. The illustration I have is not pixel-aligned in Illustrator, but that didn't stretch the image when pasted previously. It looks even more distorted horizontally when Shift+Scaling up because of the pixel difference. –  ekloff Nov 15 '13 at 22:34
    
ekloff --- i.stack.imgur.com/v7lPV.png Worth checking - Also worth checking the AI file if you have masks or effects applied there. This is somewhat off-topic in my opinion. It's more tech support related than design. –  Scott Nov 15 '13 at 22:36
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