From: Ryuichi Tamura <tam@...>
Date: 2001-12-27T13:21:28+09:00
Subject: [ruby-talk:29456] Re: imageMagick


Hi, 

At Thu, 27 Dec 2001 10:26:31 +0900,
Bashar Asad wrote:
> 
> hello,
> I wrote a very small script that will take one image file and create a thumb 
> image for it.  How can I make my script read all the image files in the 
> directory and create the thumbs?
> 
> the script:
> require "magick"
> 
> #read file image.jpg
> imagefile = Magick::Image.new("image.gif")
> 
> #scaling the image
> imaget = imagefile.dup
> imaget.scale('60%')
> 
> #writing out the thumb file
> imaget.write("filename"=>"imagethumb.gif")

please try this for example:

require 'magick'

# create a null image object.
im_seq = Magick::Image.new

# create a image sequence object which consists of
# all the GIF images(scaled at 60%) in the directory.
Dir.glob("/path/to/directory/*.gif") do |f|
  im_seq.push Magick::Image.new(f).scale('60%')
end

# create a thumbnail image.
# Images are arranged so that the thumbnail has 5 columns.
# Because ImageMagick automatically calculates 
# the appropriate row size enough to draw all the images,
# I specified an arbitraly large rows.
thumbnail = im_seq.montage({'tile'=>'5x1000'})

# output
thumbnail.write('filename'=>'imagethumb.gif')

The reference manual lacks the description for
some useful features of color and geometry specifications,
and montages options are merely listed without any
description. Following documents would be helpful. 
Sorry for inconvinience.

ImageMagick-5.x.x/www/color.html
ImageMagick-5.x.x/Magick++/Geometry.htm
ImageMagick-5.x.x/montage.html, or montage(1)


Regards,

Ryuichi Tamura