Bitmap aliasing and coordinates precision
Submitted by Jorge Hernández Valiñani
Assigned to poppler-bugs
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-
Either the rendered bitmaps have aliasing problems or the output has some horizontal lines missing.
-
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