Editing rgb2iuv - FilterMeisterWiki

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= rgb2iuv =

== Syntax ==
{{int rgb2iuv(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 i, z=1 for u, z=2 for v

== Return ==
Returns the i, u or v value depending on the value of z

== Description ==
Lets you convert RGB values to YUV values.

== Example ==
<code>
%ffp

ctl(0): "Y Adjust",range=(-255,255),val=0
ctl(1): "U Adjust",range=(-255,255),val=0
ctl(2): "V Adjust",range=(-255,255),val=0

ForEveryTile:
{
  int r,g,b,i,u,v;

for (y = y_start; y &lt; y_end; y++) {

updateProgress(y,y_end);

for (x = x_start; x &lt; x_end; x++) {

r=src(x,y,0);
      g=src(x,y,1);
      b=src(x,y,2);
		
      i=rgb2iuv(r,g,b,0) + ctl(0);
      u=rgb2iuv(r,g,b,1) + ctl(1);
      v=rgb2iuv(r,g,b,2) + ctl(2);

r=iuv2rgb(i,u,v,0);
      g=iuv2rgb(i,u,v,1);
      b=iuv2rgb(i,u,v,2);

pset(x, y, 0,  r);
      pset(x, y, 1,  g);
      pset(x, y, 2,  b);

}
  }

return true;
}
</code>

== See Also ==
((iuv2rgb))

== Comments ==
Everyone can add his comments about his experiences with this function here. Tips for using it are welcome, too.

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