Comments (1)
watermarkjs was built with the intent to only run on client side as it relies on the HTMLCanvasContext elements to exist which is only native to browsers. Typically you'd watermark on client side then upload the watermarked image to the server.
You might be able to do some hackery, or fork and update watermarkjs to use something like this https://github.com/Automattic/node-canvas to give node js canvas abilities.
The traditional way is to use something like graphicmagick gm
Here is some articles on how to do that
http://www.proccli.com/2013/10/watermark-images-with-node.js-and-graphicsmagick
https://stackoverflow.com/questions/24375090/node-js-express-and-gm-graphicsmagick-adding-watermarks-and-general-image
aheckmann/gm#276
Note: You must install graphicsmagick library on your system, or the server itself. Here are some Dockerfiles which show some of the resources you will have to install via aptitude, or apk
https://hub.docker.com/r/jameskyburz/graphicsmagick-alpine/dockerfile
https://github.com/jtblin/debian-node-graphicsmagick/blob/master/Dockerfile
And a general guide to installation:
http://www.graphicsmagick.org/README.html
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Related Issues (20)
- Watermarking on list of images eats up CPU HOT 3
- Return watermarked image as JPEG HOT 4
- CanvasPool can grow unbounded
- EXIF implementation brainstorming
- Watermartkjs does not work in IOS mobiles HOT 2
- Image is not defined HOT 2
- Text Align center of box
- How to make watermark cover 100% width? HOT 1
- lightGallery + watermakjs
- Apply watermark as a tile: multiple consequtive watermarks HOT 1
- 功能问题 HOT 2
- function to return only the url of the image
- Unable to build HOT 3
- examples are not working at all for me
- Watermark 20 images on page load is lock the page. HOT 2
- [HELP] Canvas area exceeds the maximum limit in ios safari
- window is not defined
- Multiple line text watermark.
- Re-init watermark with selected dropdown values
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