private float MaskGamma(UnaryPixelOps.Level levels)
{
int count = 0;
float total = 0;
for (int c = 0; c < 3; c++)
{
if (mask[c])
{
total += levels.GetGamma(c);
count++;
}
}
if (count > 0)
{
return total / count;
}
else
{
return 1;
}
}
private void UpdateGammaByMask(UnaryPixelOps.Level levels, float val)
{
float average = -1;
if (!(mask[0] || mask[1] || mask[2]))
{
return;
}
do
{
average = MaskGamma(levels);
float factor = val / average;
for (int c = 0; c < 3; c++)
{
if (mask[c])
{
levels.SetGamma(c, factor * levels.GetGamma(c));
}
}
} while (Math.Abs(val - average) > 0.001);
}