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Date:         Sat, 11 May 2002 06:47:34 -0700
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Sender:       ImageJ Interest Group <[log in to unmask]>
From:         Bob Dougherty <[log in to unmask]>
Organization: OptiNav, Inc.
Subject:      Re: interference filter plugin

Here is a low budget approach.  Presumably it would not be difficult to
automate in a plugin.

1. Open the RGB image and make a copy with Image/Duplicate.

2. Convert the copy to a Hue, Saturation, Brightness stack with Image/Type/HSB
Stack.

3. Using the Hue slice, choose Image/Adjust/Threshold...

4. Play with the limits (the "pass band") to isolate the pixels you want. I
believe
the scale is supposed to go: red, yellow, green, cyan, magenta, and back to
red.

5. Choose Apply.  In the Apply Lut box that appears, uncheck the last box, so
that
 "Black foreground, white background" is not selected.
When it asks whether you want to apply to all three slices, choose "No" (this
does not matter).

6. Choose Process/Image calculator.  Perform an AND between the original image
and the copy.

Bob



--
Robert Dougherty
President, OptiNav, Inc.
(425) 467-1118
[log in to unmask]
http://www.optinav.com

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