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  • poppler
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  • #295
Closed
Open
Issue created Mar 02, 2012 by Bugzilla Migration User@bugzilla-migration

Bitmap aliasing and coordinates precision

Submitted by Jorge Hernández Valiñani

Assigned to poppler-bugs

Link to original bug (#46880)

Description

Created attachment 57904 PDF with bitmap aliasing and object placement inaccuracies.

(Note: I only know how to install Macports version, today 0.18.2; I do not know if this happens in a later version)

The following PDF has two problems when rendered with pdftoppm:

pdftoppm -r 159 -f 27 -l 27 -tiff sample.pdf > output.tiff
  1. Either the rendered bitmaps have aliasing problems or the output has some horizontal lines missing.

  2. The placement of one bitmap layer (top black ink) with respect to the other one (bottom color) is inaccurate. As a result color seems displaced.

See embedded "output(pdftoppm).jpg" pointing out areas where this happens.

Rendering with pdftocairo provides no bitmap antialias whatsoever (which I would consider a bug too), so it makes it difficult to see whether the two bugs above happen or not too.

None of these issues happen when rendering with Acrobat X (i.e. Acrobat renders this PDF flawlessly).

Attachment 57904, "PDF with bitmap aliasing and object placement inaccuracies.":
sample.pdf

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