atw: Re: black and white

> yes, I mean overall in the image

OK, you'll probably need something more heavy duty, but I don't know
what. Just off the top of my head:

1. If it's a black-and-white image, the histogram may tell you what you
need. (The histogram will have only two entries.) Photoshop and I think
lots of others do histograms but Paint does not.

2. But it's probably not black-and-white, it's probably greyscale. You
can still do a histogram but it won't give you a single figure. I'm not
sure but I suspect Photoshop has a feature that will give you an
average. Other packages may too.

3. One idea that's crossed my mind from time to time is to use one of
the smudge or blur features from your favourite graphics package to
smudge out the image until it's a single grey -- but you'll need to make
sure that this grey is an accurate average of the original image. Some
experimentation will be required. Anyway, then sample the resulting grey
and compute the level.

4. You could ask a programmer to write a little program to whip through
a greyscale image and just compute the average of the pixel levels.
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