Setting transparency of ROI mask?

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I have made an ROI mask wave (8-bit unsigned) using ImageBoundaryToMask, which covers a limited portion of my image - the wave is scaled so it appears in the correct part of the image. Is there any way that if I append the mask wave I can set the colour for 0 to be completely transparent and the colour for 1 (i.e. the ROI portion) to be semitransparent setting the colour and transparency? I seems like something similar is shown on the Igor website here:
http://www.wavemetrics.com/products/igorpro/imageprocessing/roi.htm

Thanks
Hello Thomas,

An example for this is given in the Image Processing Tutorial (See File Menu->Example Experiments->Tutorials->Image Processing Tutorial). Eliminating some of the details, you can try this:
Make /O/N=(100,100) ImageWave=x*y
Make/O/B/U/N=(100,100) overlay
NewImage ImageWave
overlay=1+(ImageWave>1100)+(ImageWave<1400)
AppendImage overlay
ModifyImage overlay explicit=1, eval={3,65000,0,0}


I hope this helps,

A.G.
WaveMetrics, Inc.

March 22, 2012 at 12:37 pm - Permalink