node-red-contrib-image-tools

A Node-RED node to perform functions on images and decode barcodes.

Screenshots - to whet the appetite

Image processing...

Get image from internet...

Printing text...

Barcode decoding...

FEATURES

• Image node

  • Read image from file, http, base64 string or buffer
  • Print single or multi line text to an image
  • Over 40 image function built in with many more possible by using convolution kernels
  • Perform 1 or multiple (batch) images processes in each node
    • TIP: you can convert a function to batch JSON by clicking the button adjacent to the function dropdown field. Then simply edit the batch JSON into an array [{...},{...},{...}] to perform as many operations as needed in one go.
  • Create blank image by setting Image field to an object {"w":100,"h":100,"background":0}
  • All function parameters can be either fixed or passed in by msg/flow/global
  • Can output image data as a Jimp image, a buffer or base64 string.
  • All functions and parameters are self documenting - a tip under each item in the node editor helps the user
  • Partial (non animated) GIF loading & processing support (experimental)

• Image viewer node

  • View images in the node-red editor (for preview / debug purposes)
  • Full credit to rikukissa and dceejay for the excellent node-red-contrib-image-output on which the "image viewer node" is heavily based. (Copy of MIT license included in src files as requested)
  • Features include ability to display a jimp image, buffer, file name, base64 string, Data URL, Image URL.
  • Works in Internet Explorer (IE11 tested)

• Barcode Decode node

  • Ability to decode 1D, QR and Data Matrix barcodes. See supported formats.

• Other...

  • Built in examples.
    • In node-red, look under the hamburger menu >> import >> examples >> image tools

IMPORTANT - Breaking changes in V1

Version 1 has breaking change ~ vs ~ V0.x versions. Existing flows using the "2D Barcode Decode" node will need to be modified. The easy way of fixing this is to delete any "2D Barcode Decode" & deploy, then update the node, then re-add the new "Barcode Decode" nodes.

Alternatively, you can avoid this issue by performing the following steps...

1. Upgrade node-red-contrib-image-tools
2. Stop node-red
3. Make a backup of your flow.json file
4. Opening your flow.json file in a text editor
5. Search / replace all instances of "type":"2D Barcode Decoder" with "type":"Barcode Decoder"
6. Save and close your flow file
7. Start node-red

Pre-requisites

None!

Install

Run the following command in the root directory of your Node-RED install. (Usually this is ~/.node-red or %userprofile%\.node-red).

Install from GIT

npm install Steve-Mcl/node-red-contrib-image-tools

Install from NPM

npm install node-red-contrib-image-tools 

Alternatively, install from a folder

npm install c:/tempfolder/node-red-contrib-image-tools

Or simply copy the folder node-red-contrib-image-tools into a folder named nodes inside your node-red folder then cd into nodes/node-red-contrib-image-tools and execute npm install

NOTES

• Tested on Node V10 & V12 only. YMMV
• Bugs are likely :)

KNOWN ISSUES

Clicking the preview image in IE doesn't dismiss it (works in chrome)