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# SPDX-FileCopyrightText: 2005 The unpaper authors # # SPDX-License-Identifier: GPL-2.0-only Release 6.2, 2014-xx-xx - Tests now compare a golden file by counting the bytes that differ between it and the result. This allows non-byte-perfect calculations to be executed and still not fail the tests. This is required as fused multiply-add instructions can increase precision and thus deviate from the base C code, when using floating-point arithmetic. Release 6.1, 2014-10-23 - Compatibility with ffmpeg's implementation of libavcodec, and libav-11 and later. Release 6, 2014-08-19 - Use libav for both input and output of files, rather than custom code. This adds support for many different input file formats outside of PPM/PBM/PGM, as long as libav can reconduct them to a pixel format that is implemented. Currently that includes most versions of PNM, PNG and some variants of TIFF. - PGM and PPM files with less-than-maximum pixel depth are now fully supported. Previously they would have produced mostly white pages. - Tests are now executed against the original PNG files rather than through converted PGM/PPM, this drops the netpbm dependency on the tests. Release 5, 2013-06-28 - Implement mathematically accurate interpolation, using cubic algorithm by default. Release 0.4.2, 2012-06-22 - Fix regressions from 0.4.1 on multi-page processing. - Add tests to make sure that multi-page processing works. Release 0.4.1, 2012-06-20 - Source code split in multiple units to make it more manageable. - Options parsing is now performed through getopt_long_only(); this makes it compatible with the old parameters, while avoiding the long-winded original parser. - The --input-sequence and --output-sequence parameters have been removed for ease of porting; man page describes the new input and output file matching. - Tests are executed with the new parallel harness for speed. - Improved blurfilter by Felix Janda. Release 0.4, 2011-10-08: - New buildsystem, based on standard GNU autotools. - Optimisation of source code to produce slimmer, faster binaries. - The sources now compile using C99, and support GCC, Pathscale and Clang compilers. - Options are now documented in the unpaper(1) man page, rather than in the code. Release 0.3, 2007-12-31: - Moved history-information to CHANGELOG-file. - Two distribution archives become part of the release, one source-only variant, and one binary-distribution for i386/Linux. Archive unpaper-bin-0.3.tar.gz contains everything in unpaper-0.3.tar.gz, plus a binary executable file in folder bin/. - The final distribution packages are now created with a standard-tar via shell execution. Older versions were tarred and gzipped by ANT 1.6.5's tar- task, which had shown incompatibilities on some systems. - Included a simple makefile make.sh. It runs with minimum requirements to the compiler, while being configurable for particular optimizations via $CFLAGS. - Common style distribution package naming and content-layout, following the conventional patterns 'unpaper-0.x.tar.gz' for the archive file, which contains a root folder 'unpaper-0.x' and files 'unpaper-0.x/*' (request/bug #10793). - Added --sheet-background option. - Added --pre-shift and --post-shift options. - Removed modes 'single-rotated' and 'double-rotated' for parameter --layout. (The documentation was ambiguous and the functionality can better be achieved using --pre-rotate in combination with --layout single or --layout double.) The default layout mode is 'single' now, the old behaviour, when no --layout option was specified, can be achieved using --layout none. - Corrected some language flaws in the documentation. Thanks to Martin Collins. - Renamed Readme.txt and License.txt to more common README and LICENSE. - Fixed bug #11294: leading zeros in width/height values of pnm-files no longer cause problems. - Fixed bug #9495: resizing/stretching of color-images now works. - Fixed bug #7882: --pre-mirror h,v now correct when vertical resolution is odd Release 0.2, 2006-05-09: - Version number fallback to 0.2 (instead of counting up to 1.2). This better reflects the current development status and appears more suitable in an open-source context. - User documentation with several explaining diagrams added, see file 'doc/index.html'. - Color support added. Files of type PPM can be read, processed and written now. By default, unpaper uses the same image format for the output file as has been read from an input file, i.e. if your input is PPM, the output will be PPM automatically, if the input is PGM, the output will be PGM etc. Use parameter --type pbm|pgm|ppm to force an output file format independently from the input file format. - Better image rotation implementation. Auto-rotation of pages is now done much faster. - The --cache option became obsolete (due to new image rotation implementation). - The compiler-switch -DNOSINCOS became obsolete (due to new image rotation implementation). It is no longer needed for compilation on some platforms. - Changed to gcc version 4.1 for creating the Linux binary included in the distribution archive. gcc 4.1's executable appears to be about 20% faster than the one created with gcc 3.3.6. - Added '-fomit-frame-pointer' and '-ftree-vectorize' to compiler options. (Thanks to Olaf Marzocchi for the hint about -ftree-vectorize.) - Fix: the first pixel of an image is now correctly read (was read wrong in previous versions). - Minor fixes. Release 1.1, 2005-08-27: - Single-page input sheets can now be joined to make 2-page output sheets. See options --input-pages [1|2] and --output-pages [1|2]. - Multiple input and output filename patterns can now be specified using the options --input-file-sequence and --output-file-sequence. - Blank pages or sheets can be inserted into the sequence of input sheets using --insert-blank and/or --replace-blanks, - Zooming and stretching are now supported, see --stretch, --zoom and --post-stretch, --post-zoom. - The sheet size can be set while keeping the content's aspect ratio (and centering it with best-fitting on the sheet) using --size and --post-size. For changing the sheet size without performing any stretching/zooming of content use --sheet-size. - Faster rotation when deskewing images. The rotating algorithm has been optimized to run up to 4 times faster than before. Additional speedup may be achieved by caching intermediate results of trigonometric calculations when processing multiple page. This caching uses a lot of memory, it can be enabled using the --cache switch. - Rotation detection can now be configured to start at individual edges of the area to process. The parameter --deskew-scan-direction no longer takes v[ertical],h[orizontal] as values, but now l[eft],t[op],r[ight], b[ottom]. The default is 'l,r', which matches the previous version's default 'horizontal'. - The behaviour of the 'double' template, used with the --layout parameter by specifying "--layout double", has been changed slightly. The input images are no longer assumed to be rotated by 90 degrees, as they would be when scanned from paper with a usual ADF-scanner. That means, "--layout double" no longer implies "--pre-rotate 90" and "--post-rotate 90". To get the layout-template behaving as in earlier versions, use "--layout double-rotated", this behaves like the old "--layout double". - --border-align --border-margin allow to align page content heading towards one edge, but keeping a specified distance margin. - Using the new parameter --blackfilter-scan-exclude [l,t,r,b], areas can be specified on which the blackfilter will not work. This is useful to exclude the blackfilter from working on inner page content, e.g. to protect images with larger dark parts from deletion. Note that the --layout option may preset some blackfilter-scan-exclude masks. - The speed of the noisefilter has been optimized a bit. - The default --mask-scan-step value has been changed from 10 to 5, which should sometimes lead to better mask-area detection. - The default --deskew-scan-depth value has been changed from 0.66 to 0.5, should sometimes lead to better rotation detection. - The default --black-treshold value has been changed from 0.5 to 0.33, which should give a better looking, more saturated result when converting grayscale images to black-and-white mode. - Existing output files will no longer be overwritten by default. If an output file to be written already exists, the program terminates with an error instead. Overwriting can be allowed using the --overwrite switch. - Fix: Setting the parameter --pre-rotate or --post-rotate to 0 will no longer issue a useless warning message. - Tested on MacOS X, additional compilation instructions for MacOS have been added to the documentation. - Tested on SPARC Solaris. - Compiler switch -DNOSINCOS disables use of the sincos() function, which preserves compatibility with math libraries that do not provide this function. Release 1.0.1, 2005-03-14: - Syntax cleanups, better ANSI-C compatibility to solve some compiler issues. Using the -pedantic compiler switch, only warnings with intended origin are still issued. - Minor changes to the usage-info. Release 1.0, 2005-03-01: - Initial release.