"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "extra/pdfidiff.1" between
littleutils-1.2.3.tar.lz and littleutils-1.2.4.tar.lz

About: littleutils are a collection of small and simple utilities (rename files, search for duplicate files, ...).

pdfidiff.1  (littleutils-1.2.3.tar.lz):pdfidiff.1  (littleutils-1.2.4.tar.lz)
skipping to change at line 63 skipping to change at line 63
files where the background is predominantly black. files where the background is predominantly black.
4 Color: Here, the differences between the two files are computed on a per-RED, per-GREEN, and per- 4 Color: Here, the differences between the two files are computed on a per-RED, per-GREEN, and per-
BLUE basis and are shifted and scaled such that unchanged pixels w ill show up as 50% gray. BLUE basis and are shifted and scaled such that unchanged pixels w ill show up as 50% gray.
5 Color (stretched): Again, differences between the two files are c omputed on a per-channel and are 5 Color (stretched): Again, differences between the two files are c omputed on a per-channel and are
shifted that unchanged pixels will show up as 50% gray, but h ere the scaling is maximimized to shifted that unchanged pixels will show up as 50% gray, but h ere the scaling is maximimized to
emphasize differences. emphasize differences.
NOTES NOTES
The pdfidiff utility uses gs to convert both input files into a series of The pdfidiff utility uses pdftocairo or gs to convert both input files in
PNG image files. These files to a series of PNG image files.
are then compared using imagdiff, and the resulting image "deltas" are r These files are then compared using imagdiff, and the resulting image
eassemblied into a final PDF file "deltas" are reassemblied into a
using img2pdf. final PDF file using img2pdf.
CAVEATS CAVEATS
Because the input files are converted from PDF to PNG and are manipulated as bitmaps, the final PDF output Because the input files are converted from PDF to PNG and are manipulated as bitmaps, the final PDF output
will not contains any searchable string information, even if the input f iles did. If you need to compare will not contains any searchable string information, even if the input f iles did. If you need to compare
the text found in two different PDF files, you may have better luck with an alternate tool such as diffpdf the text found in two different PDF files, you may have better luck with an alternate tool such as diffpdf
or pdf-diff. or pdf-diff.
SEE ALSO SEE ALSO
gs(1), img2pdf(1), parallel(1), imagdiff(1), diffpdf(1), pdf-diff(1), pdf tocairo(1) gs(1), img2pdf(1), parallel(1), imagdiff(1), diffpdf(1), pdf-diff(1), pdf tocairo(1)
COPYRIGHT COPYRIGHT
Copyright (C) 2018-2020 by Brian Lindholm. This program is free software; you can use it, redistribute it, Copyright (C) 2018-2021 by Brian Lindholm. This program is free software; you can use it, redistribute it,
and/or modify it under the terms of the GNU General Public License as pub lished by the Free Software Foun- and/or modify it under the terms of the GNU General Public License as pub lished by the Free Software Foun-
dation; either version 3, or (at your option) any later version. dation; either version 3, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHO UT ANY WARRANTY; without even the This program is distributed in the hope that it will be useful, but WITHO UT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details. License for more details.
littleutils 2020 Oct 08 PDFIDIFF(1) littleutils 2021 Jan 15 PDFIDIFF(1)
 End of changes. 3 change blocks. 
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