Create images using Magick

gradiantfill.rb

require 'RMagick'
include magick

# Demonstrate the GradientFill class

Rows = 100
Cols = 300

Start = "#900"
End = "#000"

fill = Magick::GradientFill.new(0, 0, 0, Rows, Start, End)
img = Magick::Image.new(Cols, Rows, fill);

# Annotate the filled image with the code that created the fill.

ann = Magick::Draw.new
ann.annotate(img, 0,0,0,0, "GradientFill.new(0, 0, 0, #{Rows}, '#{Start}', '#{End}')") {
    self.gravity = Magick::CenterGravity
    self.fill = 'white'
    self.stroke = 'transparent'
    self.pointsize = 14
    }

#img.display
img.write("gradientfill.gif")
exit