Quantization hydra
From Adobe Labs
[edit]
Quantization source code
/*****************************************************************************
*
* Author: Joa Ebert
* http://blog.je2050.de
* Contact: j -at- je2050.de
*
*****************************************************************************/
kernel ColorQuantization
< nameSpace: "popforge::ImageProcessing";
vendor: "Joa Ebert";
version: 1;
description: "Color quantization reduces the dynamic range in an image.";
>
{
parameter float3 levels
<
minValue: float3(0.0);
maxValue: float3(256.0);
defaultValue: float3(6.0);
description: "The number of allowed values per channel.";
>;
void evaluatePixel(in image3 source, out pixel3 result)
{
pixel3 color = sampleLinear(source,outCoord());
result = color - mod(color, float3(1.0) / levels);
}
}
