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Map transparent image [message #35700]

Tue, 01 July 2003 05:59

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

Good morning everyone,
I am trying to overlay a grey-shaded mask over an image to indicate areas
where sample data are less reliable. However, I want the grey shaded area to
be transparent so that I can still see the underlying data points. I do not
want to use 'contour' since the results look rather confusing; too many
patches. As far as I can see, the IDL map_image command does not provide
such settings. Does anyone know, how the mask can be worked into the image
prior to display? What is the math that one would apply?

Thanks for helping,
Haje

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