search for: 100x75

Hello all, I'm working on a project that uses a SOM to generate feature maps from image data. Each image is a 100x75 pixels and RGBA, so 30,000 elements per image. I wanted to observe the structure of the pixel by pixel euclidean distance (where each image is a point in 30,000 dimensional space) of my image data. Sammon's projection seems appropriate for this, though I'm a bit concerned 400 images with...

...RMagick? file_column :image, :store_dir => :photo_store_dir, :magick => { :versions => { :small_thumb => { :crop => ''1:1'', :size => ''40x40>'' }, :large_thumb => { :crop => ''4:3'', :size => ''100x75>'' }, :small => { :size => ''640x480>'' }, :medium => { :size => ''800x600>'' }, :large => { :size => ''1024x768>'' } } } The above code works great. I just want to be able to use :small_...