I shall investigate them - thanks !
On Mon, Nov 17, 2008 at 4:15 AM, [EMAIL PROTECTED] [EMAIL PROTECTED]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
[EMAIL PROTECTED]
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 Messageprocessed by David InfoCenter
Subject: Re: Doing chromakey through Runrev (17-Nov-2008 9:47)
From:Jacques Hausser [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
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?
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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:
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