Class: ImageScience

Inherits:
Object
  • Object
show all
Defined in:
lib/image_science.rb

Overview

Provides a clean and simple API to generate thumbnails using FreeImage as the underlying mechanism.

For more information or if you have build issues with FreeImage, see seattlerb.rubyforge.org/ImageScience.html

Constant Summary collapse

VERSION = 
'1.2.4'

Instance Method Summary collapse

Instance Method Details

#cropped_thumbnail(size) ⇒ Object

Creates a square thumbnail of the image cropping the longest edge to match the shortest edge, resizes to size, and yields the new image.



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# File 'lib/image_science.rb', line 73

def cropped_thumbnail(size) # :yields: image
  w, h = width, height
  l, t, r, b, half = 0, 0, w, h, (w - h).abs / 2

  l, r = half, half + h if w > h
  t, b = half, half + w if h > w

  with_crop(l, t, r, b) do |img|
    img.thumbnail(size) do |thumb|
      yield thumb
    end
  end
end

#thumbnail(size) ⇒ Object

Creates a proportional thumbnail of the image scaled so its longest edge is resized to size and yields the new image.



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# File 'lib/image_science.rb', line 59

def thumbnail(size) # :yields: image
  w, h = width, height
  scale = size.to_f / (w > h ? w : h)

  self.resize((w * scale).round, (h * scale).round) do |image|
    yield image
  end
end