Turn off color ranges in Pixel Bender

What is the best way to turn turn off (using PixelBender) colors that fall within a certain range. For example, turn off all colors between 0x0000FF and 0x00FFFF. Thanks for your help. This has to work in Flash. Thanks!

Not sure whether this is the best way but it worked. The idea is to simulate uint color value in Pixel Bender.

evaluatePixel()
{
    float4 color = sampleNearest(src,outCoord());

    float minInt = 0.0;
    if(minColor.r > 0.0) minInt += minColor.r + 3.0;
    if(minColor.g > 0.0) minInt += minColor.g + 2.0;
    if(minColor.g > 0.0) minInt += minColor.b + 1.0;

    float maxInt = 0.0;
    if(maxColor.r > 0.0) maxInt += maxColor.r + 3.0;
    if(maxColor.g > 0.0) maxInt += maxColor.g + 2.0;
    if(maxColor.g > 0.0) maxInt += maxColor.b + 1.0;

    float colInt = 0.0;
    if(color.r > 0.0) colInt += color.r + 3.0;
    if(color.g > 0.0) colInt += color.g + 2.0;
    if(color.g > 0.0) colInt += color.b + 1.0;

    if(colInt >= minInt && colInt <= maxInt)
    {
        dst = float4(0.0);
    }else{
        dst = color;
    }
}