From: Joe Van Dyk <joevandyk@...>
Date: 2005-08-27T07:50:11+09:00
Subject: Re: rmagick question

On 8/26/05, Brian Schr�der <ruby.brian@gmail.com> wrote:
> On 26/08/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> > I'm trying to set the pixels of an image:
> >
> > require 'RMagick'
> >
> > width = 512
> > height = 256
> >
> > image = Magick::Image.new width, height
> >
> > width.times do |x|
> >   height.times do |y|
> >     pixel = Magick::Pixel.new rand(256), rand(256), rand(256)
> >     image.pixel_color x, y, pixel
> >   end
> > end
> >
> > image.write ARGV.shift
> >
> > But the resulting image is all black.  Why?
> >
> >
> 
> Use Magick::MaxRGB+1 instead of 256. RGB Values range from 0...2**16.
> And be shure to check out the View funktionality.

The following behavior is confusing to me.  

        p rgb
        pixel = Magick::Pixel.new(*rgb)
        image.pixel_color(e, n, pixel)
        p image.pixel_color(e, n)
        p pixel

This returns the following output:

[2, 0, 0]
red=65535, green=65535, blue=65535, opacity=0
red=2, green=0, blue=0, opacity=0

I create a new pixel, I set the image pixel to be that color, but the
image pixel is still a different color.