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Contents
#!/usr/bin/env ruby -w
require 'rmagick'
# This example demonstrates the mask attribute. The mask image must
# be the same size as the image being masked. Since this mask image does
# not have an alpha channel, the intensity of each pixel is used to define the
# mask. White pixels are more intense than black pixels, so the area of the
# image masked by white pixels will remain unchanged, while the area of the
# image masked by black pixels is affected by any transformations.
# In this example the mask is simply the words "Flower Hat" in black text
# positioned near the bottom of the white clip mask image.
img = Magick::Image.read('images/Flower_Hat.jpg').first
q = Magick::Image.new(img.columns, img.rows)
gc = Magick::Draw.new
gc.annotate(q, 0, 0, 0, 0, 'Flower Hat') do
gc.gravity = Magick::SouthGravity
gc.pointsize = 36
gc.font_weight = Magick::BoldWeight
end
# Set the matte attribute to false, indicating the absence of an alpha channel
# in the mask image. Assign the mask image to the mask= attribute of the image
# being masked.
q.matte = false
img.mask q
# Use the #level method to darken the image under the black part of the mask.
img = img.level(0, Magick::QuantumRange, 0.50)
img.write('mask.jpg')
Version data entries
15 entries across 15 versions & 3 rubygems