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<p>
This document is news about the most recent Ghostscript release. For
earlier versions, see the history documents:
<blockquote>
<a href="History9.htm">History of Ghostscript versions 9.n</a><br>
<a href="History8.htm">History of Ghostscript versions 8.n</a><br>
<a href="History7.htm">History of Ghostscript versions 7.n</a><br>
<a href="History6.htm">History of Ghostscript versions 6.n</a><br>
<a href="History5.htm">History of Ghostscript versions 5.n</a><br>
<a href="History4.htm">History of Ghostscript versions 4.n</a><br>
<a href="History3.htm">History of Ghostscript versions 3.n</a><br>
<a href="History2.htm">History of Ghostscript versions 2.n</a><br>
<a href="History1.htm">History of Ghostscript versions 1.n</a>
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<p>For other information, see the <a href="Readme.htm">Ghostscript
overview</a>.
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<h2><a name="Version9.51"></a>Version 9.51 (2020-03-02)</h2>
<p> Highlights in this release include:
<ul>
<li>
<p>9.51 is primarily a maintainance release, consolidating the changes we introduced
in 9.50.
</li>
<li>
<p>We have continued our work on code hygiene for this release, with a focus on the
static analysis tool Coverity (from <a href="https://www.synopsys.com">Synopsys, Inc</a>)
and we are now maintaining a policy of zero Coverity issues in the Ghostscript/GhostPDL
source base.
</li>
<li>
<p><b>IMPORTANT:</b> In consultation with a representative of
(<a href="http://www.openprinting.org">OpenPrinting</a>) it is
our intention to deprecate and, in the not distant future, remove the
OpenPrinting Vector/Raster Printer Drivers (that is, the <code>opvp</code>
and <code>oprp</code> devices.
<p> If you rely on either of these devices, <b><i>please</i></b> get in touch with
us, so we can discuss your use case, and revise our plans accordingly.
</li>
<li>
<p>IMPORTANT: We have forked LittleCMS2 into LittleCMS2mt (the "mt" indicating "multi-thred").
LCMS2 is not thread safe, and cannot be made thread safe without breaking the ABI. Our fork
will be thread safe, and include performance enhancements (these changes have all be been
offered and rejected upstream). We will maintain compatibility between Ghostscript and LCMS2
for a time, but not in perpetuity. If there is sufficient interest, our fork will be
available as its own package separately from Ghostscript (and MuPDF).
</li>
<li>
<p>The usual round of bug fixes, compatibility changes, and incremental improvements.
</li>
</ul>
<p>For a list of open issues, or to report problems,
please visit <a href="http://bugs.ghostscript.com/">bugs.ghostscript.com</a>.
<h3><a name="9.51_Incompatible_changes"></a>Incompatible changes</h3>
<h4>Included below are incompatible changes from recent releases (the
specific release in question listed in parentheses). We include these,
for now, as we are aware that not everyone upgrades with every release.</h4>
<ul>
<li>
<p>(9.50) There are a couple of subtle incompatibilities between the old and new SAFER
implementations. Firstly, as mentioned above, SAFER now leaves standard Postcript
functionality unchanged (except for the file access limitations). Secondly,
the interaction with <code>save</code>/<code>restore</code> operations, see
<a href="Use.htm#Safer">SAFER</a>.
<p><strong>Important Note for Windows Users</strong>:
<br>
The file/path pattern matching is case sensitive, even on Windows. This is a
change in behaviour compared to the old code which, on Windows, was case
<i>in</i>sensitive. This is in recognition of changes in Windows behaviour,
in that it now supports (although does not enforce) case sensitivity.
</li>
<li>
<p>(9.27) The process of "tidying" the Postscript name space should have removed
only non-standard and undocumented operators. Nevertheless, it is possible that
any integrations or utilities that rely on those non-standard and undocumented
operators may stop working, or may change behaviour.
<p>If you encounter such a case, please contact us (either the #ghostscript IRC channel,
or the gs-devel mailing list would be best), and we'll work with you to either find an
alternative solution or return the previous functionality, if there is genuinely no other
option.
<p>One case we know this has occurred is GSView 5 (and earlier). GSView 5 support for PDF
files relied upon internal use only features which are no longer available. GSView 5 will
still work as previously for Postscript files. For PDF files, users are encouraged to look
at <a href="https://www.mupdf.com">MuPDF</a>.
</li>
</ul>
<h3><a name="9.51_changelog"></a>Changelog</h3>
<p>See the <a href="History9.htm">history file</a> for complete log
of changes.
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<small>Copyright © 2005-2019 Artifex Software, Inc.
All rights reserved.</small>
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This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied, modified
or distributed except as expressly authorized under the terms of that
license. Refer to licensing information at <a href="https://www.artifex.com">https://www.artifex.com</a>
or contact Artifex Software, Inc., 1305 Grant Avenue - Suite 200,
Novato, CA 94945, U.S.A., +1(415)492-9861, for further information.
<p>
<small>Ghostscript version 9.51, 2 March 2020
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