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Why are there white bars between the leaders and each of the rules in this code when compiled with LuaTeX to a PDF file? When compiled (with LuaTeX) to a DVI file no white bars can be seen.

a \vrule width10pt\leaders\vrule\hfill\vrule width10pt\ b
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  • This might be a "smoothing" issue. Try to turn off optimization options like "smooth text" in the viewer. Commented Jun 7, 2014 at 20:16

1 Answer 1

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I do not get white bars:

\pdfobjcompresslevel=0
\pdfcompresslevel=0

a \vrule width10pt\leaders\vrule\hfill\vrule width10pt\ b

\bye

Result

Also the PDF page stream code looks correct:

q
1 0 0 1 100.227 759.927 cm
0 0 9.963 6.918 re f
Q
q
1 0 0 1 110.19 759.927 cm
0 0 410.992 6.918 re f
Q
q
1 0 0 1 521.182 759.927 cm
0 0 9.963 6.918 re f
Q

Horizontal positions

  • First rule: left = 100.227, width = 9.963 → right = 110.19
  • Leader rule: left = 110.19, width = 410.992 → right = 521.182
  • Last rule: left = 521.182, width = 9.963 → right = 531.148

Therefore it is very likely an issue with the PDF viewer, which you are using.

However, the three rules can be merged to one rule:

a \leaders\vrule\hskip 20pt plus 1fill\relax\ b

PDF code shows one rule:

q
1 0 0 1 100.227 759.927 cm
0 0 430.917 6.918 re f
Q
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  • I think you do---zoom in the image you posted and you should be able to see them more clearly. I admit that the bars are not exactly white but somewhat greyish. Otherwise, "my" PDF contains the same page stream code like the one you posted. Also, I tried two viewers: Evince 2.30.3 and Okular 0.10.5; both showed the bars in question.
    – SJU
    Commented Jun 7, 2014 at 19:59
  • 1
    @AngelTsankov: The image was created by ghostscript 9.05. Here indeed a green line can be seen. But I couldn't see a lighter line neither in AR9/Linux, xpdf 3.04, okular 0.14.3. It is an artefact of the PDF viewer: If I change -dGraphicsAlphaBits=4 to -dGraphicsAlphaBits=1, the grey line is gone. Commented Jun 7, 2014 at 20:27

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