Editing rgb2hsl - FilterMeisterWiki

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ZZZZ ZZZ  #######  __      __  ###      TTTT   
 ZZ   Z    ##   #  \ \    / / ## ##      TT    
  ZZ Z     ## #     \ \  / / ##   ##     TT    
   ZZ      ####      \ \/ /  ##   ##     TT    
   ZZ      ## #       \  /   ##   ##     TT    
   ZZ      ##   #      \/     ## ##      TT    
  ZZZZ    #######              ###      TTTT

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= rgb2hsl =

== Syntax ==
{{int rgb2hsl(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 H (Hue), z=1 for S (Saturation), z=2 for L (Lightness)

== Return ==
Returns the H, S or L value from 0 to 255 depending on the value of z

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

== Example ==
<code>
%ffp

ctl(0): "Adjust H", Range=(-255,255), val=0
ctl(1): "Adjust S", Range=(-255,255), val=0
ctl(2): "Adjust L", Range=(-255,255), val=0

ForEveryTile:{

int r,g,b,h,s,l;

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

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

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

h = rgb2hsl (r,g,b,0);
      s = rgb2hsl (r,g,b,1); 
      l = rgb2hsl (r,g,b,2); 
			
      // Do the HSL adjustment
      h = h + ctl(0);
      s = s + ctl(1);
      l = l + ctl(2);

pset( x, y, 0, hsl2rgb (h,s,l,0) );
      pset( x, y, 1, hsl2rgb (h,s,l,1) );
      pset( x, y, 2, hsl2rgb (h,s,l,2) );
    }
  }

return true;
}
</code>

== See Also ==
((hsl2rgb))

Summary of change:
Add document to category: