From: Jeff Rose <rosejn@...>
Date: 2005-07-20T17:31:31+09:00
Subject: Re: RMagick Help

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I happen to be doing something similar right now.  Here's some code that
should show one way to do it...  This prints out the 8-bit pixel values
for any image(s) passed on the command-line.  (Just chopping off the low
order byte...)

 Example: ruby foo.rb images/*.png

- --------------------------------

require 'RMagick'

imageList = Magick::ImageList.new(*ARGV)

imageList.each do |image|
  puts "Bits Per Pixel: #{image.depth}"

  view = image.view(0, 0, image.columns, image.rows)

  0.upto(view.width) do |x|
    0.upto(view.height) do |y|
      red = view[x][y].red >> 8
      green = view[x][y].green >> 8
      blue = view[x][y].blue >> 8

      puts "(#{red}, #{green}, #{blue})"
    end
  end

end

- -------------------------------

Peace,
Jeff

Michael Leonard wrote:
> Hello,
> 
> I finally got RMagick working on my OS X machine and I'm trying to use
> it to accomplish some things that I was previously doing with
> ImageMagick through the %x mechanism. Specifically, I want to read in an
> image and spit out a list of individual rgb values. This seems easy enough:
> 
> @sourceimage=Image::read(@filename).first
> @sourceimage.get_pixels(0, 0, @sourceimage.columns, @sourceimage.rows)
> 
> What I really want, though, is 8-bit color values (0-255) rather than
> the 16-bit values (0-65535) that get spit out. Does anyone know how to
> go about this? I feel like it must be possible, but I've been back and
> forth through the documentation and can't figure it out. Any help would
> be greatly appreciated.
> 
> Thanks,
> 
> miek
> 
> 
> 

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