From: Lance Squire <lance@...>
Date: 2006-08-05T02:08:13+09:00
Subject: Re: Ruby can't see RMagick installed from gem on FC4

unknown wrote:
>> Magick
>> ----
> 
> therefore, you've got it installed.  if you are having issues with rails 
> you
> have issues with permissions or you have two rubys installed and the web 
> users
> is using a different one
> 

This may or may not have happened when I tried to upgrade the version of 
rails.
Don't know how to check and or rectify...

> 
> anyhow.  you have installed RMagick and can use it fine from the command 
> line.
> what's your exact issue in rails then?
> 

Trying to use Rmagick to make thumbnails of images previously stored on 
the drive.

You've seen the errors above. here is the code as it stands now:

    def make_thumb(location, image, thumb)
      require 'rubygems'
      require_gem 'rmagick'
      include Magick

      pic = Magick::Image.read("#{location}#{image}")
      imgwidth = pic.columns
      imgheight = pic.rows
      imgratio = imgwidth.to_f / imgheight.to_f
      imgratio > aspectratio ? scaleratio = 64 / imgwidth : scaleratio = 
64 / imgheight
      thumb = pic.resize(scaleratio)

      white_bg = Magick::Image.new(64, thumb.height)
      pic = white_bg.composite(thumb, Magick::CenterGravity, 
Magick::OverCompositeOp)
      pic.write("#{location}#{thumb}")
    end

modified from this site:

http://www.bigbold.com/snippets/tag/rmagick
(bottom 2 examples)

Lance

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