ims

ims

ims is a standalone image manipulation, optimisation and serving service written in Go. ims provides on-the-fly resizing, cropping, rotation etc. (See full docs for an explanation of all available filters).

ims uses the excellent gift library under the hood to perform all image manipulation.

Work in progress

ims is very much a work in progress and isn't ready for production use. Please treat it as such and file issues where appropriate. As always, pull requests or other offers of help are greatly appreciated.

Documentation

Full documentation is available at the following pages:

• Installing and running ims
• Using the ims API

Optimisation

When available and configured to do so (on by default), ims will use one of a number of third-party tools to optimise the images being served. Optimisation is applied after the image has been processed by ims. Installation of the third-party tools is outside the scope of this README.

ims uses the following tools when available:

• GIF: gifsicle
• JPEG: jpegtran
• PNG: optipng

Caching

ims provides a simple on-disk cache, ensuring that unnecessary encoding work isn't repeated. When the first request comes in for a given transformation, the resulting image is written to cache and served from there if a subsequent request comes in.

ims' caching implementation is very naive at present and has no concept of expiration times or detection when the source image changes. It will be expanded to include these features in future.

Copyright & License

• Copyright © 2015 Patrick Carey (https://github.com/paddycarey)
• Licensed under the MIT license.