Remove shebang line

examples/describe.rb

@@ -1,4 +1,3 @@
-#! /usr/local/bin/ruby -w
 
 # Purpose: Demonstrate getting information from the image attributes.
 # Usage: describe.rb filename1 [filename2...]

examples/histogram.rb

@@ -0,0 +1,122 @@
+
+# Usage:		ruby histogram.rb [image filename]
+# Purpose:	draw an RGB histogram
+# Notes:		demonstrates Image#get_pixels method
+
+require 'RMagick'
+
+module Magick
+    class Image
+        HISTOGRAM_COLS = 256
+        HISTOGRAM_ROWS = 200
+
+        # Given a channel name and the frequency data for the
+        # channel, draw a histogram for the specified channel
+        def channel_histogram(color, freqs, scale, fg, bg)
+            histogram = Image.new(HISTOGRAM_COLS, HISTOGRAM_ROWS) {
+                self.background_color = bg
+                self.border_color = fg
+                }
+            gc = Draw.new
+            gc.stroke(color)
+            gc.stroke_width(1)
+
+            HISTOGRAM_COLS.times do |x|
+                gc.line(x, HISTOGRAM_ROWS, x, HISTOGRAM_ROWS-(freqs[x]*scale))
+            end
+            gc.draw(histogram)
+            return histogram
+        end
+        private :channel_histogram
+
+        # Draw histograms for each image channel plus a combined
+        # RGB histogram. Return the result as a single image.
+        def histogram(bg='black',fg='white')
+
+            # Count the level frequencies
+            red   = Array.new(HISTOGRAM_COLS, 0)
+            green = Array.new(HISTOGRAM_COLS, 0)
+            blue  = Array.new(HISTOGRAM_COLS, 0)
+
+            rows.times do |row|
+                pixels = get_pixels(0, row, columns, 1)
+                pixels.each do |pixel|
+                    v = pixel.red   & 0xff
+                    red[v]   = red[v].succ
+                    v = pixel.green & 0xff
+                    green[v] = green[v].succ
+                    v = pixel.blue  & 0xff
+                    blue[v]  = blue[v].succ
+                end
+            end
+
+            # Compute the maximum frequency. Scale to chart size.
+            max = 0
+            HISTOGRAM_COLS.times do |x|
+                max = [red[x], green[x], blue[x], max].max
+            end
+
+            # When computing the scale, add 5% "air" between
+            # the max frequency and the top of the histogram.
+            # This makes a prettier chart.
+            scale = HISTOGRAM_ROWS / (max*1.05)
+
+            # Draw the R, G, B and combined histograms.
+            charts = ImageList.new
+            charts << channel_histogram('red', red, scale, fg, bg)
+            charts << channel_histogram('rgb(0,255,0)', green, scale, fg, bg)
+            charts << channel_histogram('blue', blue, scale, fg, bg)
+            rgb = charts[0].composite(charts[1], CenterGravity, PlusCompositeOp)
+            rgb = rgb.composite(charts[2], CenterGravity, PlusCompositeOp)
+            charts.unshift(rgb)
+
+            # Make a montage.
+            histogram = charts.montage {
+                self.background_color = bg
+                self.border_width = 1
+                self.tile         = "2x2"
+                self.geometry     = "+10+15"
+                 self.stroke       = 'transparent'
+            }
+
+            # Add the filename in the middle.
+            filename = Draw.new
+            filename.annotate(histogram, 0, 0, 0, 0, self.filename) {
+                self.stroke  = 'transparent'
+                self.fill    = fg
+                self.gravity = CenterGravity
+            }
+            return histogram
+        end
+    end
+end
+
+if !ARGV[0] || ARGV[0] == '-?' then
+    puts "Usage: histogram.rb <image-file>"
+    exit
+end
+
+image = Magick::Image.read(ARGV[0])
+if image.length > 1
+    puts "Charting 1st image"
+end
+image = image.first
+
+name = File.basename(ARGV[0])
+name.sub!(/\..*$/,'')
+$defout.sync = true
+printf "Creating #{name}_Histogram.gif..."
+
+timer = Thread.new do
+    loop do
+        sleep(1)
+        printf "."
+    end
+end
+
+histogram = image.histogram
+
+histogram.write("./#{name}_Histogram.gif")
+Thread.kill(timer)
+puts "Done!"
+exit

examples/image_opacity.rb

@@ -1,4 +1,3 @@
-#! /usr/local/bin/ruby -w
 
 # Use the Image#opacity attribute to create 
 # a semi-transparent title for an image.

examples/import_export.rb

@@ -1,4 +1,3 @@
-#! /usr/local/bin/ruby -w
 
 require 'RMagick'
 include Magick

examples/pattern_fill.rb

@@ -1,4 +1,3 @@
-#! /usr/local/bin/ruby -w
 
 # Demonstrate ImageMagick's new (5.5.7-3 and later) built-in patterns.
 # Create a Fill class that can be reused to fill in new Image backgrounds.

examples/rotating_text.rb

@@ -1,4 +1,3 @@
-#!/usr/local/bin/ruby -w
 
 require 'RMagick'
 include Magick