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Re: How to Identify Pixel Color?

    Does anyone know how can I indentify with quartz composer pixels
into an image that has a white color
    and return this pixel to handle it into a composition ?

    Actually, what I'm trying to do is generate an effect only at
co-ordenates (x, y)  where
    white color appears into an image from Video Input.

Any help will be really appreciated.

You can use a Core Image kernel to create a mask depending on the white areas of the source image (keying) then use that mask to apply the effect only on the related areas of the image

check out /developer/examples/quartz composer/core image compositions/ image kernel.qtz

________________________________________________________
Pierre-Olivier Latour                            email@hidden
Quartz Composer Architect                Graphics & Imaging Team

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References: 
 >How to Identify Pixel Color? (From: William Maluf Loureiro <email@hidden>)



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