Inspector Bokeh

Experimental JavaScript library to measure blur in images. Try out the live demo or read this blog post to find out more.

Setup

1. You need Node.js.
2. Make sure Cairo is installed in your system, the canvas module requires this. How to install node-canvas.
   • On OS X or macOS with Homebrew: brew install pkg-config cairo pango libpng jpeg giflib librsvg
3. npm install

Usage

Simply run npm start path/to/image/file.jpg

Troubleshooting

On macOS 12 Monterey: canvas.node can’t be opened

Full error message:

“canvas.node” can’t be opened because Apple cannot check it for malicious software.

This software needs to be updated. Contact the developer for more information.

• If this error pops up, click Show in Finder.
• Right-click the file canvas.node, select Open with and choose Other....
• Make sure Enable: All Applications is selected. Pick /Applications/Utilities/Terminal.app (the default macOS Terminal).
• Confirm that you really want to open it.
• Run npm start path/to/image/file.jpg again - this time an Open button will be displayed in the dialog.
• After choosing Open once, subsequent attempts of running the script will work without showing any dialog.

This possibly happens only if you cloned this repo onto a Volume mounted from a disk image file (.dmg). The reason is macOS' Gatekeeper trying to protect you from running software from an "unidentified developer".