(If you want to screenshot first, and want to rotate the screen: xrandr -o left (and use xrandr -o normal to return to regular view).)
Open Terminal in the folder with all the images and
convert *.png -shave 90x280 shaved*.png
Blog: TTTThis
Uses qpdf, imagemagick, ocrmypdf, and pdftotext.
0 Rename pdf to orig.pdf
1 Extract the paragraph from the pdf
- qpdf orig.pdf --pages . 100-110 -- just-the-chapter.pdf
2 Create vr.pdf (VeryReadable)
- convert -density 288 just-the-chapter.pdf output-%02d.jpg
- convert output*.jpg -level 25% final-%02d.jpg
- convert final*.jpg vr.pdf
3 Create text layer on vr.pdf as a new pdf
- ocrmypdf -l spa vr.pdf vr-layer-spa.pdf
4 Convert that new pdf to .txt
- pdftotext -layout vr-layer-spa.pdf chapter-spa.txt
5 Delete everthing except the new txt file and the new layered pdf * rm output* && rm final* && rm vr.pdf && rm just-the-chapters.pdf
All at once:
qpdf orig.pdf --pages . 318-419 -- just-the-chapters.pdf && convert -density 288 just-the-chapters.pdf output-%02d.jpg && convert output*.jpg -level 25% final-%02d.jpg && convert final*.jpg vr.pdf && ocrmypdf -l spa vr.pdf bookonech9-10.pdf && pdftotext -layout bookonech9-10.pdf bookonech9-10.txt && rm output* && rm final* && rm vr.pdf && rm just-the-chapters.pdf
TTTThis
It relies on tesseract for its OCR (https://ocrmypdf.readthedocs.io/en/latest/languages.html), so you need tesseract's language packs (http://tttthis.com/blog/convert-image-to-text-tesseract-ocr) to do other languages.
"OCRmyPDF that will add a text layer to a scanned PDF making it searchable"
FOSS
sudo apt-get install ocrmypdf
ocrmypdf input.pdf output.pdf
SPANISH (characters, otherwise it won't be able to copy-paste ¿)
ocrmypdf -l spa input.pdf output-spa.pdf
TTTThis
- Make a gradient of dark blue and light blue
- Colors > Map > Gradient
- (NOTE you can also do this by Windows > Dockable dialogs > Palette, and drag over some colors dark to light, then do Map > Palette, which gives you a more rangy color effect)
- (NOTE or you can do Colors > Colorize) THEN
- r-click blue layer > Add layer mask > Black full transparency
- Now you can use any tool (pen, airbrush, square and fill) and create that color
TTTThis
