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Subject: Re: Detection of pixels
Date: Thu, 1 Nov 2007 01:08:40 +0000 (UTC)
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Hi,
Perhaps someone will give you a fuller answer, but in case they don't I will ask 
you 2 things:
 - does you image contain flat colours, and so you just want to count the pixels 
which are a particular shade of blue, or is it more complicated than that (e.g. 
there are blue pixels which aren't part of the lake, or there are different shades 
of blue in the lake)?
 - do you have the image processing toolbox?

I wasn't sure if you meant a 'colourmap', or a map like you'd find in an atlas.