Re-2: Doing chromakey through Runrev

Jonathan Lynch jonathandlynch at gmail.com
Mon Nov 17 10:01:42 EST 2008


I shall investigate them - thanks !

On Mon, Nov 17, 2008 at 4:15 AM, runrev at animabit.de <runrev at animabit.de>wrote:

> 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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>
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-- 
Do all things with love



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