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Transparent Image on Background

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28 Jul 2004 (Updated )

Allows to merge a background with a transparent foreground without using alphadata.

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Description

This quite simple function (immerge.m, as in "image merge") allows to display two images, one on each other, the one in the foreground being transparent (transparency weighted).

Creates an image 'out'.
'out' has 'bg' as background, and 'fg' (transparent, weighted by 'coef') above 'bg'.
Useful when one cannot use OpenGL as renderer, but still wants to have transparency!
'out', 'bg', and 'fg' are RGB images.

merged = immerged(bg, fg, coef)
- bg matrix of type double or uint8
- fg matrix of type double or uint8
- coef is a scalar between 0 and 1, or a matrix of such scalars, same (r,c) size as 'fg' and 'bg' (similar to AlphaData).

Suggestions for future development:
- allow to have 'coef' referring to the AlphaMap
- allow 'coef' to take values between 1 and 64.

The function comes with a short demo script.

MATLAB release MATLAB 6.5.1 (R13SP1)
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Comments and Ratings (6)
19 Mar 2014 med med

Thanks

30 May 2013 j-noel T.

Works great! thanks

26 Nov 2008 Shadi

Works great with me.

29 Mar 2008 suman ghosh  
18 Jan 2007 Jamie Simpson

Works great. I was able to use it for functions other than imview(). Just substitute the graphing function you want with imview(), such as pcolor(), for example.

09 Nov 2004 Peter Cremona-Simmons

I could not try/use it because imview() function is not available to me.

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