BrightnessTo3Colors
From Adobe Labs
[edit]
Source
// Filter by David Lollar
// December 2007
// works for Flash
kernel BrightnessTo3Colors
< nameSpace : "dlollar";
vendor : "none";
version : 1;
description : "this filters breaks up image into highest brightness,
middle brightnessmand lowest brightness, then replaces those with 3
solid colors. Use the paramters to change the solid colors. Use the other
2 parameters to adjust the border bands for middle brightness.";
>
{
parameter float hiEnd
<
minValue: 1.5;
maxValue: 3.0;
defaultValue: 1.5;
>;
parameter float loEnd
<
minValue: 0.0;
maxValue: 1.5;
defaultValue: 0.0;
>;
parameter float3 aColor
<
minValue: float3(0.0, 0.0, 0.0);
maxValue: float3(1.0, 1.0, 1.0);
defaultValue: float3(1.0, 0.0, 0.0);
>;
parameter float3 bColor
<
minValue: float3(0.0, 0.0, 0.0);
maxValue: float3(1.0, 1.0, 1.0);
defaultValue: float3(0.0, 1.0, 0.0);
>;
parameter float3 cColor
<
minValue: float3(0.0, 0.0, 0.0);
maxValue: float3(1.0, 1.0, 1.0);
defaultValue: float3(0.0, 0.0, 1.0);
>;
void
evaluatePixel(image4 src, out float4 dst)
// depending on your version of Toolkit, you may need "in" above for evaluatePixel
{
dst = sampleNearest(src,outCoord());
float brightness = dst.r + dst.g + dst.b;
dst.rgb = (brightness < hiEnd) ? cColor : aColor;
float3 currentColor = dst.rgb;
dst.rgb = (brightness < loEnd) ? bColor : currentColor;
}
}
