Module: Vips::Process::Resize

Defined in:
lib/vips-process/resize.rb

Constant Summary collapse

SHARPEN_MASK = 
begin
  conv_mask = [
    [ -1, -1, -1 ],
    [ -1, 24, -1 ],
    [ -1, -1, -1 ]
  ]
  ::VIPS::Mask.new conv_mask, 16
end

Instance Method Summary collapse

Instance Method Details

#resize_to_fill(width, height) ⇒ Object

Resize the image to fit within the specified dimensions while retaining the aspect ratio of the original image. If necessary, crop the image in the larger dimension.

Parameters:

  • width —

    Integer the width to scale the image to

  • height —

    Integer the height to scale the image to



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# File 'lib/vips-process/resize.rb', line 35

def resize_to_fill(width, height)
  manipulate! do |image|
    image = resize_image image, width, height, :max
    top   = 0
    left  = 0

    if image.x_size > width
      left = (image.x_size - width) / 2
    elsif image.y_size > height
      top = (image.y_size - height) / 2
    end

    image.extract_area left, top, width, height
  end
  self
end

#resize_to_fit(width, height) ⇒ Object

Resize the image to fit within the specified dimensions while retaining the original aspect ratio. The image may be shorter or narrower than specified in the smaller dimension but will not be larger than the specified values.

Parameters:

  • width —

    Integer the width to scale the image to

  • height —

    Integer the height to scale the image to



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# File 'lib/vips-process/resize.rb', line 21

def resize_to_fit(width, height)
  manipulate! do |image|
    resize_image image, width, height
  end
  self
end

#resize_to_height(height) ⇒ Object

Resize the image to a certain height. It will keep its width in relation.

Parameters:

  • height —

    Integer the height to scale the image to



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# File 'lib/vips-process/resize.rb', line 83

def resize_to_height(height)
  manipulate! do |image|
    resize_image image, image.x_size, height
  end
  self
end

#resize_to_limit(width, height) ⇒ Object

Resize the image to fit within the specified dimensions while retaining the original aspect ratio. Will only resize the image if it is larger than the specified dimensions. The resulting image may be shorter or narrower than specified in the smaller dimension but will not be larger than the specified values.

Parameters:

  • width —

    Integer the width to scale the image to



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# File 'lib/vips-process/resize.rb', line 60

def resize_to_limit(width, height)
  manipulate! do |image|
    image = resize_image(image, width, height) if width < image.x_size || height < image.y_size
    image
  end
  self
end

#resize_to_width(width) ⇒ Object

Resize the image to a certain width. It will keep its height in relation.

Parameters:

  • width —

    Integer the width to scale the image to



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# File 'lib/vips-process/resize.rb', line 72

def resize_to_width(width)
  manipulate! do |image|
    resize_image image, width, image.y_size
  end
  self
end