Bash notes related to images and pdf files

images-pdfs.md

Batch processing

• Install batcher Gimp plugin by copying its extracted folder to ~/.config/GIMP/3.0/plug-ins.
• Multiple images can be easily resized from its gui in gimp.

Multiple images to pdf

• Gimp not used because the pdf produced is too large on the disk.
• convert (from imagemagick) and img2pdf without the --imgsize option, produce pages of different sizes in the same pdf document.
• Without sorting by number, wildcards would sort files in an alphabetical order.

$ sudo pacman -Sy img2pdf
$ img2pdf -o file.pdf --imgsize 72dpi $(ls -1 *.jpg | sort -n | tr '\n' ' ')

Split pdf into multiple images

$ pdfimages -png file.pdf image

Pdf to image

Without the density option, its default value (72 dpi) resulted in lower quality images:

$ convert -density 300 document.pdf -resize image.jpg

Merge multiple pdfs

$ pdfunite in-1.pdf in-2.pdf in-n.pdf out.pdf