class Ii
Constants
- VERSION
Public Class Methods
resize(filename, new_filename, resize_ratio)
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# File lib/ii.rb, line 9 def self.resize(filename, new_filename, resize_ratio) # read the image img = Magick::Image.read(filename).first # get the image height and width width = img.columns height = img.rows # calculate the dest height and width dest_height = height*resize_ratio dest_width = width*resize_ratio # make sure height and width is not 0 dest_height = dest_height < 1 ? 1 : dest_height dest_width = dest_width < 1 ? 1:dest_width # resize the new image # the api can be found at http://studio.imagemagick.org/RMagick/doc/constants.html#GravityType new_img = img.resize(dest_width, dest_height, Magick::LanczosFilter, 0.8) new_img2 = img. # set quality new_img.write(new_filename) {self.quality = 70 } # clean the RAM img.destroy! new_img.destroy! end