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October 22, 2015: Release 1.13
Some critical bugs in the processing of BMP files were fixed. These
bugs allowed the program to be crashed, or potentially to be abused
in other ways, by feeding it specially crafted BMP files. Thanks to
Tomasz Buchert and Agostino Sarubbo for reporting these bugs.
Portability was improved for C99 and for MSVC++. Thanks to Peter
Breitenlohner, Nelson Beebe, and Martin Gieseking for reporting
portability issues.
March 24, 2015: Release 1.12
Fixed memory overflow bug triggered by very large bitmaps. Fixed
binary file mode on 64-bit Windows. Portability improvements.
February 19, 2013: Release 1.11
A GeoJSON backend was added; thanks to Christoph Hormann for
contributing this. Support for bitfields in the BMP format was
added. A minor change was made to the behavior of the alphamax
parameter; a value of 0 now gives a true polygon.
August 19, 2011: Release 1.10
A DXF backend was added. The output is in the drawing interchange
format used by computer aided design software. Thanks to Jonas
Benedett Dorr for testing. The Gimppath backend was changed to be
compatible with current versions of Gimp. The EPS, PDF, and SVG
backends now use high-resolution bounding boxes. The default scaling
of the EPS, PDF, and SVG backends is now fixed at 72dpi. A new option
--flat was added to the SVG backend. A new option --tight was added
to remove whitespace around the input image before calculating its
scaling and placement.
December 21, 2010: Release 1.9
The xfig and eps backends were improved, and a fixed pagesize PDF
backend was added. Support for BMP version 4 and version 5 files, as
well as top-down BMP files, was added. Minor speed improvements to
Potrace and major speed improvements to mkbitmap. A Gaussian blur
option was added to mkbitmap. Libtool is now used to build and
optionally install the Potrace library. An optional simplified
progress bar was added for dumb terminals. This release also contains
some portability improvements, cross-compilation improvements, and
minor bug fixes.
April 9, 2007: Release 1.8
This release contains minor bugfixes and portability improvements.
Rotation is now implemented in the PDF backend.
March 6, 2005: Release 1.7
This is a bugfix release. A bug in the progress bar code, which
caused arithmetic exceptions on some 64-bit architectures, has been
fixed.
February 27, 2005: Release 1.6
This release contains an algorithm improvement that leads to a
speedup of 20-60% over previous versions of Potrace. A new PDF
backend was added, courtesy of Tor Andersson. An option --progress
was added for displaying a progress bar. The Windows version of
Potrace now uses MinGW instead of Cygwin, eliminating the need to
install a special DLL alongside the executable programs, and solving
some problems with wildcards and executable PostScript files. Some
spurious "premature end of file" messages were eliminated. The
core functionality of Potrace was separated into a library with a
documented API, making it easier for developers to incorporate
Potrace into other GPL-licensed software.
July 8, 2004: Release 1.5
The LZW patent has finally expired in Canada. Therefore, postscript
level 2 compression can now be implemented directly within Potrace,
without having to rely on the external "compress" program. This
release makes the necessary corrections.
March 6, 2004: Release 1.4
This is a bugfix release. Fixed the bug which sometimes caused
Potrace to "hang" on large input files. Also fixed some bugs in the
compression code. The presence of the "compress" program is now
determined at run-time, rather than compile-time. No new features or
command line options were added.
January 15, 2004: Release 1.3
This is primarily a bugfix release. Version 1.2 fatally crashed when
applied to an empty (all white) bitmap. The options -2 and -3 are now
ignored when unsupported, rather than causing an error. There were
some improvements to the test suite, autoconfiguration, and
portability. The bounding box in the xfig backend was fixed, and the
postscript output now has better page encapsulation. Bitmaps of
dimension 0 are now tolerated better.
December 23, 2003: Release 1.2
New experimental Gimppath and XFig backends were added. A separate
program mkbitmap was added, which can be used as a preprocessor to
Potrace. It turns greyscale or color images into high-quality
bitmaps with optional scaling and filtering. New options --opaque,
--group, and --fillcolor were added for greater flexibility in
generating editable PostScript and SVG output. The bitmap
decomposition algorithm was improved and can now take advantage of
64-bit platforms. Portability and autoconfiguration were vastly
improved, and a test suite was added. Runlength encoded BMP files can
now be read. Some bugs in command line options were fixed.
August 18, 2003: Release 1.1
The most important new feature of this release is an SVG (scalable
vector graphics) backend. This file format can be read by vector
graphics manipulation programs such as sodipodi, as well as web
browsers with an SVG plugin. I also added PGM, PPM, and BMP as
additional input file formats. The new --blacklevel and --invert
options control how non-black-and-white images are converted to
bitmaps before being processed by Potrace. The implementation of a
critical function has been improved to make Potrace even faster on
large input files; this results in speedups of up to factor 3.3
relative to Potrace 1.0. Autoconfiguration was improved, and the code
was polished to compile on more different architectures. The error
messages for wrong file formats were also improved.
August 10, 2003: Release 1.0
First public release.
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