Re-2: Doing chromakey through Runrev

[runrev at animabit.de]

Hello,

I once found two stacks with the names

ImageTrans.rev
and one with
altMakeTrans.rev from altuit 

which both do what you want and have the necessary scripts within.

Try altuit ...

Mit freundlichen Grüßen
Franz Böhmisch

boehmisch at animabit.de
http://www.animabit.de
GF Animabit Multimedia Software GmbH
Am Sonnenhang 22
D-94136 Thyrnau
Tel +49 (0)8501-8538
Fax +49 (0)8501-8537





Original Message        processed by David InfoCenter 
Subject: Re: Doing chromakey through Runrev (17-Nov-2008 9:47)
From:    Jacques Hausser <jacques.hausser at unil.ch>
To:      boehmisch at animabit.de


Hi Jonathan,

I'm surprised that nobody answered till now. I did not try 
chromakeying myself, but I would suggest
1) to sample the color of blue background (perhaps at different places to get an amplitude of variation of the color - it is never absolutely constant) with the mouseColor function. Alternatively, put arbitrary 
limits at + - n pixels of each channel of the sampled color.
2) to identify pixels of the image of which the color is in these limits
3) to set the corresponding pixels of the alphadata or ot the maskdata of this image to 0. Then the image with be transparent except for what you want to keep
4) to replace the pixels of the imageData of your new background 
image by the non-transparent pixels of the first image
-- or alternatively to put the partially transparent image over the 
background image, what allow to change the scale, for example, and 
then to use a snapshot to merge the two images (at screen definition)
6) to use the alphadata or the maskdata of the first image to identify the limits of the incrusted one, and to apply some blurring algorithm to the pixels around this limit. Without that, the limit will appear 
jaggered.

The two images must of course have exactly the same dimensions in 
pixel rows and columns. Look at the dictionnary for imageData,MaskData and alphaData for details... and tell us about your experiences !

good luck

Jacques

Le 16 nov. 2008 à 21:59, Jonathan Lynch a écrit :

> Does anyone have any suggestions on how to do professional-quality
> photographic chromakeying (like blue screen or green screen) with 
> RunRev?
>
> -- 
> Do all things with love
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******************************************
Prof. Jacques Hausser
Department of Ecology and Evolution
Biophore / Sorge
University of Lausanne
CH 1015 Lausanne
please use my private address:
6 route de Burtigny
CH-1269 Bassins
tel/fax: ++ 41 22 366 19 40
mobile: ++ 41 79 757 05 24
E-Mail: jacques.hausser at unil.ch
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