[Techtalk] Gimp tutorials

[A. Mani]

On Fri, Oct 18, 2013 at 7:54 AM, Akkana Peck <akkana at shallowsky.com> wrote:
> I see people advocating djvu, but my one experience with a djvu book
> wasn't very positive. It had all the limitations of PDF, plus there
> was no reader for it available in the Debian repos (let alone for
> an e-reader device). I did find one via a web search and was able
> to read the book, but it was a lot of hassle.

okular, djview, evince

#sudo apt-cache search djvu

djvulibre-dbg - Debug symbols for the DjVu image format
evince - Document (PostScript, PDF) viewer
evince-common - Document (PostScript, PDF) viewer - common files
evince-dbg - Document (PostScript, PDF) viewer - debugging symbols
gir1.2-evince-3.0 - GObject introspection data for the evince libraries
libdjvulibre-dev - Development files for the DjVu image format
libdjvulibre-text - Linguistic support files for libdjvulibre
libdjvulibre21 - Runtime support for the DjVu image format
libevdocument3-4 - Document (PostScript, PDF) rendering library
libevince-dev - Document (PostScript, PDF) rendering library - development files
libmagickcore5-extra - low-level image manipulation library - extra codecs
didjvu - DjVu encoder with foreground/background separation
djview-plugin - Browser plugin for the DjVu image format
djview4 - Viewer for the DjVu image format
djvulibre-bin - Utilities for the DjVu image format
djvulibre-desktop - Desktop support for the DjVu image format
djvulibre-plugin - Transition package, djvulibre-plugin to djview-plugin
djvuserve - CGI program for unbundling DjVu files on the fly
djvusmooth - graphical editor for DjVu
evince-gtk - Document (PostScript, PDF) viewer (GTK+ version)
gscan2pdf - GUI to produce PDFs or DjVus from scanned documents
libminidjvu-dev - Small DjVu encoder/decoder, development files
libminidjvu0 - Small DjVu encoder/decoder, shared library
minidjvu - Monochrome DjVu multipage encoder, single page encoder/decoder
ocrodjvu - tool to perform OCR on DjVu documents
okular-extra-backends - additional document format support for Okular
pct-scanner-scripts - scan and create merged DjVu and PDF documents
for archiving
pdf2djvu - PDF to DjVu converter
python-djvu - Python support for the DjVu image format
python-djvu-dbg - Python support for the DjVu image format (debug extension)
python-djvu-doc - Python support for the DjVu image format (documentation)
scantailor - Interactive post-processing tool for scanned pages
zathura-djvu - DjVu support for zathura
libmagickcore4-extra - low-level image manipulation library - extra codecs

__________________________


>  There's an economics book I've been
> wanting to read, and it's available free online, but only as a PDF
> where the text is in two columns side by side. The PDF is impossible
> to read on a handheld device (5" or 6" screen) and there's no way to
> convert 2-column PDF to any other format (I wasted an incredible
> amount of time trying).

( what did you try?
Transform pixel values, segment, and apply rules.
or
Just look at neighboring pixel values, then assign grades and apply
morphological techniques + rules )


There are many good tools for this task (and for all types of pdf )

k2pdfopt, cut2col

http://code.google.com/p/papercrop/

calibre


Best

A. Mani



A. Mani
CU, ASL, AMS, CLC, CMS
http://www.logicamani.in