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Re: Semi-transparent filled contours with direct graphics [message #90389 is a reply to message #90387]

Fri, 27 February 2015 11:52

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

geogal34 writes:

> I have two HDF5 files of satellite data from different sensors. There's no trouble reading them in and mapping them separately, but I'd like to create a composite image with one as a semi-transparent layer. I've tried displaying the maps using MAP and CONTOUR and some of the cgimage/cgmap_set commands, but the images seem to only display properly using MAP_SET and TVSCL. I can easily draw contours (contour procedure) over the base image (visible imagery), but can't
figure out a way to make the contours fill with any level of transparency. I know the CONTOUR function has transparency, but I haven't had luck displaying the base imagery properly so direct graphics seems to be the best option at the moment. I've done a lot of searching online and have still come up with nothing. Has anyone had any luck doing something like this with direct graphics?
>

I do this kind of thing all the time:

http://www.idlcoyote.com/color_tips/color_overlay.php

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Semi-transparent filled contours with direct graphics By: geogal34 on Fri, 27 February 2015 11:44
		Re: Semi-transparent filled contours with direct graphics By: David Fanning on Fri, 27 February 2015 11:52
		Re: Semi-transparent filled contours with direct graphics By: geogal34 on Fri, 27 February 2015 12:06
		Re: Semi-transparent filled contours with direct graphics By: David Fanning on Fri, 27 February 2015 12:10
		Re: Semi-transparent filled contours with direct graphics By: geogal34 on Wed, 04 March 2015 10:59
		Re: Semi-transparent filled contours with direct graphics By: David Fanning on Wed, 04 March 2015 11:04

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