From: Chris Metcalfe <contact@...>
Date: 2008-05-30T03:23:15+09:00
Subject: Ruby .read image upside down?

Sorry the above message posted prematurely.

The code is as follows:

if params[:thumbnail] !=nil && params[:thumbnail] != ""
  virtual_item.thumbnail = params[:thumbnail].read
  virtual_item.thumbnail_content_type = 
params[:thumbnail].content_type.chomp
end

Now the .read function read the image properly.  However it is being 
stored in the database upside down.  The rows of the image are flipped 
only vertically, which is strange, and not both vertically and 
horizontally backwards.  I'm assuming that there is a some 'header' 
bytes which describe the image, then the actual pixel data list row by 
row.  We are reading PNG files.

The 3D rendering software outputs the images the right side up, but once 
they have been transfered and saved in the database they are upside 
down.

Any ideas on how we can investigate whether the .read function is doing 
something strange or prove that truly the params[:thumbnail] parameter 
actually contains upside down data?
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