public FastBoxBlur()
{
// initialize format translation dictionary
_formatTranslations[PixelFormat.Format8bppIndexed] = PixelFormat.Format8bppIndexed;
_formatTranslations[PixelFormat.Format24bppRgb] = PixelFormat.Format24bppRgb;
_formatTranslations[PixelFormat.Format16bppGrayScale] = PixelFormat.Format16bppGrayScale;
_formatTranslations[PixelFormat.Format48bppRgb] = PixelFormat.Format48bppRgb;
}