Image -> ASCII conversion : Help Wanted

Greetings,

I have a simple 3 colour image (white, blue, black) that is 2000x2000
pixels in size. It is a
grid, where the gridlines are black, and squares are either filled with
white or blue.  It is
derived from making a layer in a Photoshop image and then just copying
the contents of
the layer into a new file, so it can be any format that Photoshop 5.0
can save in, in case the
file type is of great importance.

What I want to do is to find out the information for each x,y coordinate
and import that
information into a spreadsheet, like Excel. For example, let's say that
the x,y = 200, 400
(ie: the pixel is located 200 pixels across from the left, and 400 up
from the bottom of the
image).

If that pixel is black, I want to be able to convert that information so
that I can read it in
Excel. I don't care whether it is defined as white = 1, black = 2, blue
=3, or whether it is
defined as white = FFFFFF, black = 000000, blue = 0000FF, or whether it
is defined as
white = 255-255-255, black = 0-0-0, blue = 0-0-255. or any symbols, so
long as I can differentiate between the tree tones.   I can use Excel to
extract the
information I need.

According to the Photoshop help files, the RAW format should be the one
I use, but I am
having problems with it.  Every time I save the file in RAW format and
try to open it with Excel, I just get the same character (a "y" with two
dots above it (umlaut?)) about 200 times, with no spaces between
characters.

My next thought was that perhaps a program that took an image and
converted it to ASCII art might solve the problem.  I've done a search,
but found nothing out there able to handle images that are 2000x2000
pixels.

Can anyone help me to locate software which might be of use?  You can
either reply here, or directly to me via t.c...@landfood.unimelb.edu.au

Thanks in advance,

Trav.

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