Odd Layer Size in Exported EPS File Depending on Document DPI

[walt.farrell]

Playing around with document DPI a bit, I noticed something odd.

I made a 64x64 px document, with an artboard, at 72 DPI. I drew a rectangle on the artboard, covering it completely, and gave the rectangle a 2px stroke, aligned to the inside. I then exported it as an EPS file. Upon opening the EPS file, everything looked fine:

Original:

EPS:

 

I then did the same thing, with a new document, at 300 DPI instead of 72 DPI. I know that the document size of the EPS will become 72/300 of the original size, and it did. But something else happened that seems wrong:

Original at 300 DPI:

The EPS it generated:

When done at 72 DPI, the white layer is the same size as the rectangle with the black stroke. When done at 300 DPI, the white layer is larger, and the rectangle is placed at its lower left corner.

That seems wrong.

my64x64-artboard@72dpi.afdesign

my64x64-artboard@300dpi.afdesign

my64x64-artboard@300dpi.eps

my64x64-artboard@72dpi.eps

[Gabe]

Hey @walt.farrell,

This is because EPS specifies the document size as an integer number of points. See more here:

 

[walt.farrell]

Thanks, Gabe. That makes sense.