Rszr

Rszr is a fast image resizer.

Installation

In your Gemfile:

gem 'rszr'

Imlib2

Rszr requires the Imlib2 library to do the heavy lifting.

OS X

Using homebrew:

brew install imlib2

Linux

Using your favourite package manager:

yum install imlib2 imlib2-devel

apt-get install libimlib2 libimlib2-dev

Usage

# bounding box 400x300
image = Rszr::Image.load('image.jpg')
image.resize(400, 300)

# save it
image.save('resized.jpg')

# auto height
image.resize(400, :auto)

# auto width
image.resize(:auto, 300)

# scale factor
image.resize(0.5)

# crop
image.crop(200, 200, 100, 100)

# save memory, do not duplicate instance
image.resize!(400, :auto)

# image dimensions
image.width => 400
image.height => 300
image.dimensions => [400, 300]

Speed

Resizing an 1500x997 JPEG image to 800x532, 100 times:

Library	Time
MiniMagick	11.4 s
GD2	7.2 s
Rszr	3.2 s