@martip/node-red-pdf-to-png

A Node-RED node that converts PDF pages to PNG images, using PDF.js and node-canvas.

Install

N.B If you're on an Apple Mac running on Apple Silicon (M1, M2 etc.), please read below.

Either use the Node-RED Menu - Manage Palette - Install, or run the following command in your Node-RED user directory - typically ~/.node-red

npm install @martip/node-red-pdf-to-png

Apple Silicon

This node depends on node-canvas, for which an Apple Silicon (ARM Architecture) release is not available yet.

You can still use this node but you'll have to install it manually. Be sure to have Homebrew installed on your Mac and follow these instructions:

> brew install pkg-config cairo pango libpng jpeg giflib librsvg
> git clone https://github.com/martip/node-red-pdf-to-png.git
> cd node-red-pdf-to-png
> cwd=$(pwd)
> npm uninstall canvas
> npm install
> npm install canvas
> cd ~/.node-red
> npm install $cwd
> unset cwd

Restart Node-RED when done.

Node-RED will use the local version of this package, instead of the published one. (don't remove the node-red-pdf-to-png folder!).

Usage

You pass the PDF as a buffer in the msg.payload.

Various options can be set in the node configuration dialog:

• Pages (all, first, range)
• Zoom (10% to 1600%)
• PNG Compression level (0 to 9)
• PNG Resolution (dpi)