seejayjames

Hello, I'm sure this is probably very simple but I was hoping to pick someone's brain about it.

Say I have a picture / video of some mountains and a sky and I'd like to manipulate only those RGB values that are close to the general sky-blue color. Ideally (and I'm sure this is easy in Max) a settable range of color tolerance as well as where in the matrix pixels are or aren't affected. I know jit.chromakey will get the selection, but how might I manage the selected pixels? Perhaps that resulting matrix would be manipulated, then mixed back into the original? Guess I'm not sure how to manipulate, then re-mix back in so that the effect can be anything from subtle to extreme (generally most effects seem to be extreme).

Thanks for humoring me, it's probably rather noobish of a question, but I'd be interested to see what others have done with this.

manipulating-certain-rgb-values-in-a-matrix

what about using those selected pixels from jit.chromakey as an alpha 

On Mar 8, 2007, at 11:04 PM, Seejay James wrote:

> Hello, I'm sure this is probably very simple but I was hoping to 

> Say I have a picture / video of some mountains and a sky and I'd 

> like to manipulate only those RGB values that are close to the 

> general sky-blue color. Ideally (and I'm sure this is easy in Max) 

> a settable range of color tolerance as well as where in the matrix 

> pixels are or aren't affected. I know jit.chromakey will get the 

> selection, but how might I manage the selected pixels? Perhaps that 

> resulting matrix would be manipulated, then mixed back into the 

> original? Guess I'm not sure how to manipulate, then re-mix back in 

> so that the effect can be anything from subtle to extreme 

> (generally most effects seem to be extreme).

> Thanks for humoring me, it's probably rather noobish of a question, 

> but I'd be interested to see what others have done with this.

what about using those selected pixels from jit.chromakey as an alpha  
channel, and going on from there?

>
> Hello, I'm sure this is probably very simple but I was hoping to  
> pick someone's brain about it.
>
> Say I have a picture / video of some mountains and a sky and I'd  
> like to manipulate only those RGB values that are close to the  
> general sky-blue color. Ideally (and I'm sure this is easy in Max)  
> a settable range of color tolerance as well as where in the matrix  
> pixels are or aren't affected. I know jit.chromakey will get the  
> selection, but how might I manage the selected pixels? Perhaps that  
> resulting matrix would be manipulated, then mixed back into the  
> original? Guess I'm not sure how to manipulate, then re-mix back in  
> so that the effect can be anything from subtle to extreme  
> (generally most effects seem to be extreme).
>
> Thanks for humoring me, it's probably rather noobish of a question,  
> but I'd be interested to see what others have done with this.
>
> -CJ
>


Manipulating certain RGB values in a matrix