[Poppler-bugs] [Bug 24081] New: problem combining gradient with transparency

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=24081

           Summary: problem combining gradient with transparency
           Product: poppler
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: tilli.falck at gmx.net


Created an attachment (id=29754)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29754)
pdf containing gradient

Viewing the attached PDF in evince or KPDF (from CentOS 5.3) or okular (Ubuntu
karmic) shows horizontal lines in the gradient that do not show in acroread.
The effect is more pronounced in KPDF/okular where the lines are darker than in
evince in which they are white.

Also attached a ppm generated with "pdftoppm version 0.10.7" which shows the
same behavior as KPDF/okular.

The gradient is linear with an opaqueness of 70%. Fully opaque gradients render
fine as well as solid fills with an opaqueness less than one.

A minimal latex file to reproduce the behavior is

----
\documentclass[a4paper]{article}

\usepackage{fullpage}
\usepackage[x11names]{xcolor}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
 \shade[top color=Green4, bottom color=Green2,fill opacity=.7] (0,0) rectangle
(5,23);
\end{tikzpicture}

\end{document}
----

Best regards
Tillmann


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