Something I have been meaning to raise for some time - and am now prompted
to do so after seeing all the great images at Leicester: Some of the more
interesting data come from the use of multiple MSG-1 channels added or
subtracted from one another. EUMETSAT actually publish a list of
subtractions suitable for different phenomena. There must be colleagues in
our network who know how to make these special colour composite images - I
have only been able to get rather simple and uninformative black and white
images myself using the 'arthmetic' command in PaintShopPro (thanks David)
but colour is the secret.
Arne wrote a very helpful piece in RIG 69 which I have found useful. But
it would be good now to move on to more specialist imagery.
By way of an example (with apologies to those who don't have a copy of
'Image'): the image at bottom left of p.6 of 'Image' shows high
thunderstorm clouds overshooting into the stratosphere using channels WV
7.3 and IR 10.8. What are the steps through which one would produce such an
So does anyone have time to post a short tutorial on this, perhaps for
later hard-copy publication? We need a child's guide - step by step how to
turn two black and white images into a colour-composite. At this stage I
would settle for single images - though plainly there must be techniques
for batch operations (I can't believe all those superb animations were done
by hand, one frame by one!).
It may be that the production of a single composite image is a very simple
operation, but until you've been taken through it once, it remains a bit of
a mystery. So, how about it, someone?
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