From: Joe Van Dyk <joevandyk@...>
Date: 2005-08-26T13:33:07+09:00
Subject: Re: rmagick question

On 8/25/05, 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?

And here's some code from my actual application:
   
    pixel = Magick::Pixel.new(*rgb)
    puts "The image pixel was: <#{ image.pixel_color(e, n) }>"
    image.pixel_color(e, n, pixel)
    puts "The pixel was <#{ pixel }>"
    puts "The image pixel is now: <#{ image.pixel_color(e, n) }>"

And here's the result:
    The image pixel was: <red=65535, green=65535, blue=65535, opacity=0>
    The pixel was <red=175, green=206, blue=117, opacity=0>
    The image pixel is now: <red=65535, green=65535, blue=65535, opacity=0> 

Why on earth isn't it setting the pixel color on the image?