Dave P

Is it possible to reduce the colour depth of an image in a matrix below the apparent 24 bit minimum? The smallest data type I can use for the matrix is a char but I want to go down to say 4 or 16 colours in an image.

It may be something I'm obviously missing but I'm a newbie.

colour-depth-reduction

use jit.charmap but with a matrix map with a lower matrix size, like 

[ 4 char 4 4] and fill them. that would make 16 bit color (total, 

not per channel right guys?), just try it out. Alter the charmap 

On Aug 4, 2006, at 11:28 AM, Dave P wrote:

> Is it possible to reduce the colour depth of an image in a matrix 

> below the apparent 24 bit minimum? The smallest data type I can use 

> for the matrix is a char but I want to go down to say 4 or 16 

> It may be something I'm obviously missing but I'm a newbie.

> MAX/MSP 4.5.7 | PLUGGO 3.5.4 | Nuendo 3 (latest) | WIN XP Home | 

use jit.charmap but with a matrix map with a lower matrix size, like  
[ 4 char 4 4]  and fill them. that would make 16 bit color (total,  
not per channel right guys?), just try it out. Alter the charmap  
helpfile.

>
> Hi
>
> Is it possible to reduce the colour depth of an image in a matrix  
> below the apparent 24 bit minimum? The smallest data type I can use  
> for the matrix is a char but I want to go down to say 4 or 16  
> colours in an image.
>
> It may be something I'm obviously missing but I'm a newbie.
>
> Thanks, Dave
> --
> MAX/MSP 4.5.7 | PLUGGO 3.5.4 | Nuendo 3 (latest) | WIN XP Home |  
> Intel Celeron 2.8GHz | Sony Vaio
>

I'll try that.... when I've cooked some dinner.

with a normal 4 char matrix, you can try doing a bitwise AND with jit.op. like this:

I got both techniques working - so now I'm spoilt for choice.

Colour Depth Reduction