Consider the following SVG:
The intended effect of the shape-rendering="crispEdges" annotation is to prevent there being a visible seam between the two rectangles, no matter how the rendering is scaled. This works as intended when viewing the SVG file in both Firefox and Chromium. However, when I convert the SVG into a PDF using inkscape -A and view the PDF, I can still see a visible seam at some zoom levels, e.g. as in this screen shot:
Moreover, the PDF page stream produced by inkscape is identical with and without shape-rendering="crispEdges"
1 0 0 -1 0 15 cm
q
0.705882 0.705882 0.705882 rg /a0 gs
0 0 15 15 re f
0.705882 0.768627 0.705882 rg 15 0 15 15 re f
Q
and the /ExtGState dictionary referenced as /a0 is also identical:
/ExtGState <<
/a0 <<
/CA 1
/ca 1
>>
>>
This could mean that there is no equivalent in PDF of this SVG feature, or it could mean that Inkscape's PDF exporter doesn't implement the equivalent. I'm not having any luck finding anything that sounds like this SVG feature in the PDF specification, which is an argument in favor of "no equivalent", but the PDF spec is gigantic and I could easily have missed something.
So the question is: Is or isn't there an equivalent in PDF of this SVG feature, and if there is, how do I use it? I am prepared to edit my exported PDF by hand if I have to.
Note 1: The example is minimal; I originally noticed the problem with a much more complicated figure from an academic paper, in which there are many such rectangles aligned to a grid, but some grid positions are empty. I tried enlarging the rectangles in the original figure so they would overlap, and I was not able to find an amount of enlargement that eliminated all visible seams without also visibly causing the rectangles to bleed into the empty spaces.
Note 2: With the original figure, the problem is visible with Evince, pdf.js, and two printers manufactured by different companies.
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