Editing rgb2ycbcr - FilterMeisterWiki

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= rgb2ycbcr =
== Syntax ==
:{{int rgb2ycbcr(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 Y, z=1 for Cb, z=2 for Cr
== Return ==
:Returns the Y, Cb or Cr value from 0 to 255 depending on the value of z
== Description ==
:Lets you convert RGB values to YCbCr values.
== Example ==
<code>
%ffp

ctl(0):"Y (Luminancy)",Range=(-255,255),val=0
ctl(1):"Cb (Chroma Blue)",Range=(-255,255),val=0
ctl(2):"Cr (Chroma Red)",Range=(-255,255),val=0

ForEveryTile:{
	int r,g,b,i,cb,cr;

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);

i = rgb2ycbcr (r,g,b,0);
			cb = rgb2ycbcr (r,g,b,1); 
			cr =rgb2ycbcr (r,g,b,2); 
			
			
			//Do the adjustment
			i = i + ctl(0);
			cb = cb + ctl(1);
			cr = cr + ctl(2);

pset( x, y, 0, ycbcr2rgb (i,cb,cr,0) );
			pset( x, y, 1, ycbcr2rgb (i,cb,cr,1) );
			pset( x, y, 2, ycbcr2rgb (i,cb,cr,2) );

}}

return true;

}
</code>
== Also see ==
:((ycbcr2rgb))
== Comments ==
:Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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