Ruby RMagick

RMagickHelper.rb

require 'RMagick'


def export_gif()
    newGif = Magick::ImageList.new("images/ass.png", "images/ss.png", "images/gr.jpg", "images/image512.png")
    newGif.write("animated.gif")
end

def read_image_properties()
    img = Magick::Image.read("images/ss.png").first
    puts "   Format: #{img.format}"
    puts "   Geometry: #{img.columns}x#{img.rows}"
    puts "   Class: " + case img.class_type
                            when Magick::DirectClass
                                "DirectClass"
                            when Magick::PseudoClass
                                "PseudoClass"
                        end
    puts "   Depth: #{img.depth} bits-per-pixel"
    puts "   Colors: #{img.number_colors}"
    puts "   Filesize: #{img.filesize}"
    puts "   Resolution: #{img.x_resolution.to_i}x#{img.y_resolution.to_i} "+
        "pixels/#{img.units == Magick::PixelsPerInchResolution ?
        "inch" : "centimeter"}"
end

def minify_image_size()
    img = Magick::Image.read("images/ss.png").first
    puts "Before Filesize: #{img.filesize / 1000}"
    img.minify!
    img.write("ass_out.png")
    puts "After Filesize: #{img.filesize / 1000}"
end

def check_image_alpah()
    image = Magick::Image.read("images/ss.png").first
    if image.alpha?
        img_w = image.columns
        img_h = image.rows
        bg = Magick::Image.new(img_w, img_h) { self.background_color = "pink" } # create a white background
        image = bg.composite(image, Magick::NorthWestGravity, 0, 0, Magick::OverCompositeOp) # compose
    end
    image.write("ass_out.png")
end

# export_gif
# read_image_properties
# minify_image_size
# check_image_alpah