ghostscript

Flatten and optimize PDF with shell command Ghostscript gsx.

Install

The npm module requires shell command Ghostscript to be installed on the machine.

# OSX
brew install ghostscript

# Alpine
apk update
apk add imagemagick ghostscript-fonts ghostscript

# Debian/ubuntu
apt-get update
apt-get install ghostscript

Installation of the npm

npm install @lpgroup/ghostscript

Example

const { readfilesync, writeFile } = require("fs");
const { resolve } = require("path");
const { optimize } = require("@lpgroup/ghostscript");

const fileIn = resolve("./test/flytt_uppdrag.pdf");
const fileOut = resolve("./test/flytt_uppdrag_optimized.pdf");

const input = readfilesync(fileIn);
optimize({ input }).then((output) => {
  writeFile(fileOut, output, "binary");
});

API

env DEBUG

This package uses the debug npm. Debug messages are printed to stdout if the follwoing is set.

export DEBUG=ghostscript

optimize({options})

Following are all values that can be used in options and the default values that are used if none is entered.

optimize({
  input,
  compressFonts: true,
  embedAllFonts: true,
  subsetFonts: true,
  dpi: 300,
  colorConversionStrategy: "RGB",
});

Raw shell command

Below is the shell command executed by node, if you'd like to optimize it further yourself. Credit goes to Matt DesLauriers and the repo http://github.com/mattdesl/gsx-pdf-optimize

Removed according to https://stackoverflow.com/questions/49686527/ghostscritpt-converted-file-not-view-able-in-adobe-reader -dPDFSETTINGS=/screen -dCompatibilityLevel=1.5

cat test/large-file.pdf | \
gsx -sDEVICE=pdfwrite \
-dNOPAUSE \
-dQUIET \
-dBATCH \
-dSubsetFonts=true \
-dCompressFonts=true \
-dEmbedAllFonts=true \
-sOutputFile=- - > flytt_uppdrag_optimized.pdf

Contribute

See contribute

License

MIT - See licence