Editing rgb2cmyk - FilterMeisterWiki

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= rgb2cmyk =

== Syntax ==
{{int rgb2cmyk(int r, int g, int b, int z)}}

== Arguments ==
:'''r'''
::Red value
:'''g'''
::Green value
:'''b'''
::Blue value
:'''z'''
::Determines which value is returned. z=0 for C (Cyan), z=1 for M (Magenta), z=2 for Y (Yellow) and z=3 for K (Black)

== Return ==
Returns the C, M, Y or K value from 0 to 255 depending on the value of z

== Description ==
Lets you convert RGB color values to CMYK color values.

== Example ==
<code>
%ffp

ctl(0): "Adjust C", Range=(-255,255), val=0
ctl(1): "Adjust M", Range=(-255,255), val=0
ctl(2): "Adjust Y", Range=(-255,255), val=0
ctl(3): "Adjust K", Range=(-255,255), val=0

ForEveryTile:{

int r,g,b,cyan,mag,yel,k;

for (y= y_start; y < y_end; y++) {

if (updateProgress(y, y_end)) abort();

for (x = x_start; x < x_end; x++) {
				
      r = src(x,y,0);
      g = src(x,y,1);
      b = src(x,y,2);

cyan = rgb2cmyk(r,g,b,0);
      mag = rgb2cmyk(r,g,b,1); 
      yel = rgb2cmyk(r,g,b,2); 
      k = rgb2cmyk(r,g,b,3); 
			
      // Do the CMYK adjustment
      cyan = cyan + ctl(0);
      mag = mag + ctl(1);
      yel = yel + ctl(2);
      k = k + ctl(3);

pset( x, y, 0, cmyk2rgb(cyan,mag,yel,k,0) );
      pset( x, y, 1, cmyk2rgb(cyan,mag,yel,k,1) );
      pset( x, y, 2, cmyk2rgb(cyan,mag,yel,k,2) );
    }
  }

return true;
}
</code>

== See Also ==
((cmyk2rgb)), ((rgb2hsl))

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