QuickThumb-Slug

QuickThumb-Slug is an on the fly, thumbnail creation middleware for express based on the QuickThumb lib but using pre-defined sizes to avoid malicious exploitation of the library. It utilizes the popular *nix image library, ImageMagick. It allows for the automatic creation of thumbnails by adding a final slug to image filenames. It's ideal for web developers who would like to easily experiment with different size thumbnails, wihout having to worry about pre-generating an entire library.

Examples

var express = require('express'),
    app = express(),
    qt = require('quickthumb-slug');

app.use(qt.static({
    baseDir: __dirname + "/public",
    sizes: {
        square: { width: 400, height: 400, type: "crop" },
        landscape: { width: 1200, height: 600, type: "crop" },
        fitinportrait: { width: 400, height: 700, type: "resize" }
    }
}));

<img src="/public/images/red-square.gif" />

Install

npm install quickthumb-slug

ImageMagick is required for this module, so make sure it is installed.

Ubuntu

apt-get install imagemagick

Mac OS X

brew install imagemagick

Fedora/CentOS

yum install imagemagick

Usage

qt.static(options)

Middleware to replace express.static() or connect.static().

options is an object to specify customizations. It currently has the following options:

• baseDir is the original directory where source images are located.
• cacheDir The directory where generated images will be created. If not supplied, images will be created in [baseDir]/.cache/
• sizes Object containing configurations for image outputs, properties are the slugs that will be used in filenames
  • width Width of resized image
  • height Height of resized image
  • type The type of imagemagick conversion to take place. There are currently only two options:
    • crop (default) Crops and zooms images to the exact size specified. Proxy to imagemagick.crop.
    • resize Resizes an image to fit within the specified dimensions, but actual dimensions may not be exactly as specified. Proxy to imagemagick.resize.
• quality The quality to use when resizing the image. Values should be between 0 (worst quality) and 1 (best quality)

Resizing of images is directed by the image name. This is in the format [filename-without-ext]-[slug][original-ext]. E.g. red-square.gif

Resized images will be created on an as needed basis, and stored in [cacheDir]/[slug]/[dim].

If the slug is not present, the original image will be served.