Title: [893] trunk/image_voodoo:
Add a greyscale method to turn image into greyscale, along with a sample (
we need to start adding tests, though)
- Revision
- 893
- Author
- headius
- Date
- 2008-02-08 10:42:02 -0500 (Fri, 08 Feb 2008)
Log Message
Add a greyscale method to turn image into greyscale, along with a sample (we need to start adding tests, though)
Modified Paths
Added Paths
Diff
Modified: trunk/image_voodoo/lib/image_voodoo.rb (892 => 893)
--- trunk/image_voodoo/lib/image_voodoo.rb 2008-02-08 15:41:30 UTC (rev 892)
+++ trunk/image_voodoo/lib/image_voodoo.rb 2008-02-08 15:42:02 UTC (rev 893)
@@ -41,9 +41,6 @@
graphics.set_rendering_hint(
RenderingHints::KEY_INTERPOLATION,
RenderingHints::VALUE_INTERPOLATION_BICUBIC)
- graphics.set_rendering_hint(
- RenderingHints::KEY_COLOR_RENDERING,
- RenderingHints::VALUE_COLOR_RENDER_QUALITY)
w_scale = width.to_f/@src.width
h_scale = height.to_f/@src.height
@@ -56,6 +53,20 @@
yield ImageVoodoo.new(target)
end
+
+ def greyscale
+ target = BufferedImage.new(
+ width, height, BufferedImage::TYPE_USHORT_GRAY)
+ graphics = target.graphics
+ graphics.set_rendering_hint(
+ RenderingHints::KEY_INTERPOLATION,
+ RenderingHints::VALUE_INTERPOLATION_BICUBIC)
+
+ graphics.draw_rendered_image @src, nil
+ graphics.dispose
+
+ yield ImageVoodoo.new(target)
+ end
def save(file)
return false if file !~ /\.(.*)$/
Added: trunk/image_voodoo/samples/file_greyscale.rb (0 => 893)
--- trunk/image_voodoo/samples/file_greyscale.rb (rev 0)
+++ trunk/image_voodoo/samples/file_greyscale.rb 2008-02-08 15:42:02 UTC (rev 893)
@@ -0,0 +1,9 @@
+require 'image_voodoo'
+
+# reads in the file specified by ARGV[0], transforming to greyscale and
+# writing to the file specified by ARGV[1]
+ImageVoodoo.with_image(ARGV[0]) do |img|
+ img.greyscale do |img2|
+ img2.save(ARGV[1])
+ end
+end
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